diff --git a/frontend/eslint.config.js b/frontend/eslint.config.js
index 16be318dfa..20decc3ca4 100644
--- a/frontend/eslint.config.js
+++ b/frontend/eslint.config.js
@@ -143,12 +143,4 @@ export default [
       }
     },
   },
-  {
-    // TEMPORARY IGNORES, to be gotten rid of as soon as possible - 2025-07-24 RM
-    files: ['**/*.svelte', '**/*.svelte.ts'],
-    rules: {
-      'svelte/require-each-key': 'off',
-      'svelte/no-useless-mustaches': 'off',
-    },
-  },
 ];
diff --git a/frontend/src/lib/components/HgLogView.svelte b/frontend/src/lib/components/HgLogView.svelte
index 4b3c0fb9a4..51163b5a1b 100644
--- a/frontend/src/lib/components/HgLogView.svelte
+++ b/frontend/src/lib/components/HgLogView.svelte
@@ -136,7 +136,7 @@
   </thead>
   <tbody>
     {#if logEntries?.length}
-      {#each expandedLog as log, idx}
+      {#each expandedLog as log, idx (log.node)}
         <tr>
           {#if idx === 0}
             <td class="py-0 w-0" rowspan="1000000">
diff --git a/frontend/src/lib/components/ProjectList.svelte b/frontend/src/lib/components/ProjectList.svelte
index 6b208bb430..927db94868 100644
--- a/frontend/src/lib/components/ProjectList.svelte
+++ b/frontend/src/lib/components/ProjectList.svelte
@@ -14,7 +14,7 @@
 </script>
 
 <div class="grid grid-cols-1 xs:grid-cols-2 sm:grid-cols-3 auto-rows-fr gap-2 md:gap-4 max-xs:justify-items-center">
-  {#each projects as project}
+  {#each projects as project (project.id)}
     {#if project.isDraft}
       <div class="draft card aspect-square bg-base-200 overflow-hidden">
         <div class="bg" style="background-image: url('{getProjectTypeIcon(project.type)}')"></div>
diff --git a/frontend/src/lib/components/Projects/ProjectConfidentialityFilterSelect.svelte b/frontend/src/lib/components/Projects/ProjectConfidentialityFilterSelect.svelte
index f41ef4a611..4b3f55c7a5 100644
--- a/frontend/src/lib/components/Projects/ProjectConfidentialityFilterSelect.svelte
+++ b/frontend/src/lib/components/Projects/ProjectConfidentialityFilterSelect.svelte
@@ -21,7 +21,7 @@
 <div class="relative">
   <Select {...rest} label={$t('project.confidential.confidentiality')} helpLink={helpLinks.confidentiality} bind:value>
     <option value={undefined}>{$t('common.any')}</option>
-    {#each Object.entries(options) as [value, label]}
+    {#each Object.entries(options) as [value, label] (value)}
       <option {value}>{$t(label)}</option>
     {/each}
   </Select>
diff --git a/frontend/src/lib/components/Projects/ProjectFilter.svelte b/frontend/src/lib/components/Projects/ProjectFilter.svelte
index 5cebab0d9d..56e728a4e0 100644
--- a/frontend/src/lib/components/Projects/ProjectFilter.svelte
+++ b/frontend/src/lib/components/Projects/ProjectFilter.svelte
@@ -98,7 +98,7 @@
   {loading}
 >
   {#snippet activeFilterSlot({ activeFilters })}
-    {#each activeFilters as filter}
+    {#each activeFilters as filter (filter.key)}
       {#if filter.key === 'projectType'}
         <ActiveFilter {filter}>
           <ProjectTypeIcon type={filter.value} />
diff --git a/frontend/src/lib/components/Projects/ProjectTable.svelte b/frontend/src/lib/components/Projects/ProjectTable.svelte
index 7868f3599a..bce5b16294 100644
--- a/frontend/src/lib/components/Projects/ProjectTable.svelte
+++ b/frontend/src/lib/components/Projects/ProjectTable.svelte
@@ -55,7 +55,7 @@
       </tr>
     </thead>
     <tbody>
-      {#each projects as project}
+      {#each projects as project (project.id)}
         <tr>
           {#if isColumnVisible('name')}
             <td>
diff --git a/frontend/src/lib/components/Projects/WritingSystemList.svelte b/frontend/src/lib/components/Projects/WritingSystemList.svelte
index 5d33428974..8863dc64eb 100644
--- a/frontend/src/lib/components/Projects/WritingSystemList.svelte
+++ b/frontend/src/lib/components/Projects/WritingSystemList.svelte
@@ -13,7 +13,7 @@
 <div class="w-full">
   {#if writingSystems.length > 0}
     <BadgeList>
-      {#each writingSystems as ws}
+      {#each writingSystems as ws (ws.tag)}
         <WritingSystemBadge tag={ws.tag} isActive={ws.isActive} isDefault={ws.isDefault} />
       {/each}
     </BadgeList>
diff --git a/frontend/src/lib/components/TrainTracks.svelte b/frontend/src/lib/components/TrainTracks.svelte
index 8cdbee9351..dc4da188c9 100644
--- a/frontend/src/lib/components/TrainTracks.svelte
+++ b/frontend/src/lib/components/TrainTracks.svelte
@@ -113,10 +113,10 @@
 {#if circles?.length > 0}
   <svg width={maxWidth} height="0" style="height: 100%">
     {#if rowHeights?.length > 0}
-      {#each curves as curve}
+      {#each curves as curve, i (i)}
         <path fill="none" stroke={curve.color} stroke-width="1.5" d={curve.d} />
       {/each}
-      {#each svgDots as c}
+      {#each svgDots as c, i (i)}
         <circle cx={c.x} cy={c.y} r={circleSize} fill={c.color} stroke="none" style="" />
       {/each}
     {/if}
diff --git a/frontend/src/lib/components/Users/UserFilter.svelte b/frontend/src/lib/components/Users/UserFilter.svelte
index dd4c9c542e..2e606c99e7 100644
--- a/frontend/src/lib/components/Users/UserFilter.svelte
+++ b/frontend/src/lib/components/Users/UserFilter.svelte
@@ -54,8 +54,8 @@
   {loading}
 >
   {#snippet activeFilterSlot({ activeFilters })}
-  
-      {#each activeFilters as filter}
+
+      {#each activeFilters as filter (filter.key)}
         {#if filter.key === 'userType' && filter.value}
           <ActiveFilter {filter}>
             {#if filter.value === 'admin'}
@@ -76,10 +76,10 @@
           </ActiveFilter>
         {/if}
       {/each}
-    
+
   {/snippet}
   {#snippet filterSlot()}
-  
+
       <h2 class="card-title">{$t('admin_dashboard.user_filter.title')}</h2>
       {#if filterEnabled('userType')}
         <div class="form-control">
@@ -97,6 +97,6 @@
           </label>
         </div>
       {/if}
-    
+
   {/snippet}
 </FilterBar>
diff --git a/frontend/src/lib/components/Users/UserProjects.svelte b/frontend/src/lib/components/Users/UserProjects.svelte
index 4d74392e99..d56841b331 100644
--- a/frontend/src/lib/components/Users/UserProjects.svelte
+++ b/frontend/src/lib/components/Users/UserProjects.svelte
@@ -73,7 +73,7 @@
         </tr>
       </thead>
       <tbody>
-        {#each projects as proj}
+        {#each projects as proj (proj.id)}
           {@const isManager = proj.memberRole === ProjectRole.Manager}
           <tr>
             <td class="p-0 w-4">
diff --git a/frontend/src/lib/components/Users/UserTable.svelte b/frontend/src/lib/components/Users/UserTable.svelte
index 7191608461..f22affe7b8 100644
--- a/frontend/src/lib/components/Users/UserTable.svelte
+++ b/frontend/src/lib/components/Users/UserTable.svelte
@@ -30,7 +30,7 @@
     </tr>
   </thead>
   <tbody>
-    {#each shownUsers as user}
+    {#each shownUsers as user (user.id)}
       <tr>
         <td>
           <div class="flex items-center gap-2 max-w-40 @xl:max-w-52">
diff --git a/frontend/src/lib/forms/DisplayLanguageSelect.svelte b/frontend/src/lib/forms/DisplayLanguageSelect.svelte
index e1c57bd8c2..17a93cd5be 100644
--- a/frontend/src/lib/forms/DisplayLanguageSelect.svelte
+++ b/frontend/src/lib/forms/DisplayLanguageSelect.svelte
@@ -25,7 +25,7 @@
     <!-- Make sure we don't overwrite persisted locales that we don't support yet -->
     <option {value}>{value} ({$t('account_settings.language.not_supported')})</option>
   {/if}
-  {#each availableLocales as locale}
+  {#each availableLocales as locale (locale)}
     <option value={locale}>{localNames[locale] ?? locale}</option>
   {/each}
 </Select>
diff --git a/frontend/src/lib/forms/ProjectTypeSelect.svelte b/frontend/src/lib/forms/ProjectTypeSelect.svelte
index 048eca8920..a74556080a 100644
--- a/frontend/src/lib/forms/ProjectTypeSelect.svelte
+++ b/frontend/src/lib/forms/ProjectTypeSelect.svelte
@@ -25,7 +25,7 @@
     {#if undefinedOptionLabel}
       <option value={undefined}>{undefinedOptionLabel}</option>
     {/if}
-    {#each types as type}
+    {#each types as type (type)}
       <option value={type}><FormatProjectType {type} /></option>
     {/each}
     {#if includeUnknown}
diff --git a/frontend/src/lib/forms/RadioButtonGroup.svelte b/frontend/src/lib/forms/RadioButtonGroup.svelte
index e9009d893e..9fd3b9c389 100644
--- a/frontend/src/lib/forms/RadioButtonGroup.svelte
+++ b/frontend/src/lib/forms/RadioButtonGroup.svelte
@@ -39,7 +39,7 @@
   <div class="legend" id={`label-${id}`}>
     {label}
   </div>
-  {#each buttons as button}
+  {#each buttons as button (button.value)}
     <div class="form-control w-full">
       <label class="label cursor-pointer justify-normal pb-0">
         <input {id} type="radio" bind:group={value} value={button.value} class="radio mr-2 {variant ?? ''}" />
diff --git a/frontend/src/lib/forms/UserTypeSelect.svelte b/frontend/src/lib/forms/UserTypeSelect.svelte
index 55ca0f1abe..33216a08ee 100644
--- a/frontend/src/lib/forms/UserTypeSelect.svelte
+++ b/frontend/src/lib/forms/UserTypeSelect.svelte
@@ -22,7 +22,7 @@
     {#if undefinedOptionLabel}
       <option value={undefined}>{undefinedOptionLabel}</option>
     {/if}
-    {#each Object.entries(options) as [value, label]}
+    {#each Object.entries(options) as [value, label] (value)}
       <option {value}>{$t(label)}</option>
     {/each}
   </Select>
diff --git a/frontend/src/lib/forms/UserTypeahead.svelte b/frontend/src/lib/forms/UserTypeahead.svelte
index 55b4b743b7..4f13609c78 100644
--- a/frontend/src/lib/forms/UserTypeahead.svelte
+++ b/frontend/src/lib/forms/UserTypeahead.svelte
@@ -133,7 +133,7 @@
     />
     <div class="overlay-content">
       <ul class="menu p-0">
-      {#each filteredResults as user, idx}
+      {#each filteredResults as user, idx (user.id)}
         <li class={(highlightIdx == idx) ? 'p-0 bg-primary text-white' : 'p-0'}><button class="whitespace-nowrap" onclick={() => {
           setTimeout(() => selectUser(user));
         }}>{formatResult(user)}</button></li>
diff --git a/frontend/src/lib/layout/Breadcrumbs/Breadcrumbs.svelte b/frontend/src/lib/layout/Breadcrumbs/Breadcrumbs.svelte
index fccfca6d69..78e7908fee 100644
--- a/frontend/src/lib/layout/Breadcrumbs/Breadcrumbs.svelte
+++ b/frontend/src/lib/layout/Breadcrumbs/Breadcrumbs.svelte
@@ -9,7 +9,7 @@
 
 <div class="text-sm breadcrumbs p-0 max-xs:invisible">
   <ul>
-    {#each $crumbs as crumb}
+    {#each $crumbs as crumb, i (i)}
       <RenderElement tag="li" el={crumb}/>
     {/each}
   </ul>
diff --git a/frontend/src/routes/(authenticated)/admin/AdminTabs.svelte b/frontend/src/routes/(authenticated)/admin/AdminTabs.svelte
index e4d1419ccd..43073926ec 100644
--- a/frontend/src/routes/(authenticated)/admin/AdminTabs.svelte
+++ b/frontend/src/routes/(authenticated)/admin/AdminTabs.svelte
@@ -24,7 +24,7 @@
 
 <div role="tablist" class="hidden admin-tabs:flex tabs tabs-lifted tabs-lg overflow-x-auto">
   <div class="tab tab-divider"></div>
-  {#each adminTabs as tab}
+  {#each adminTabs as tab (tab)}
     {@const isActiveTab = activeTab === tab}
     <button
       onclick={() => onClickTab?.(tab)}
diff --git a/frontend/src/routes/(authenticated)/admin/EditUserAccount.svelte b/frontend/src/routes/(authenticated)/admin/EditUserAccount.svelte
index 5462ea8c52..f221a64480 100644
--- a/frontend/src/routes/(authenticated)/admin/EditUserAccount.svelte
+++ b/frontend/src/routes/(authenticated)/admin/EditUserAccount.svelte
@@ -145,7 +145,7 @@
       <div>
         Feature flags:
         <ul>
-          {#each allPossibleFlags as flag}
+          {#each allPossibleFlags as flag (flag)}
             <li>
               <label
                 ><input type="checkbox" name="featureFlags" value={flag} bind:group={$form!.featureFlags} />
diff --git a/frontend/src/routes/(authenticated)/authorize/+page.svelte b/frontend/src/routes/(authenticated)/authorize/+page.svelte
index ff8d247111..5aa2eb6477 100644
--- a/frontend/src/routes/(authenticated)/authorize/+page.svelte
+++ b/frontend/src/routes/(authenticated)/authorize/+page.svelte
@@ -30,7 +30,7 @@
       </div>
       <div class="bg-base-200/50 py-5 px-8">
         <div class="grid gap-x-3 gap-y-5" style="grid-template-columns: auto 1fr">
-          {#each data.scope?.split(' ') ?? [] as scope}
+          {#each data.scope?.split(' ') ?? [] as scope (scope)}
             {#if scope === 'profile'}
               <div class="grid grid-cols-subgrid col-span-full items-center">
                 <AuthenticatedUserIcon size="text-4xl" />
@@ -53,7 +53,7 @@
         </div>
       </div>
       <div>
-        {#each Object.entries(data.postback) as [key, value]}
+        {#each Object.entries(data.postback) as [key, value] (key)}
           <!--parameters required to resume the auth process-->
           <input type="hidden" name={key} {value} />
         {/each}
diff --git a/frontend/src/routes/(authenticated)/org/[org_id]/BulkAddOrgMembers.svelte b/frontend/src/routes/(authenticated)/org/[org_id]/BulkAddOrgMembers.svelte
index 783d1f8e28..2c2fe7f7e4 100644
--- a/frontend/src/routes/(authenticated)/org/[org_id]/BulkAddOrgMembers.svelte
+++ b/frontend/src/routes/(authenticated)/org/[org_id]/BulkAddOrgMembers.svelte
@@ -110,7 +110,7 @@
         {#if addedMembers.length > 0}
           <div class="mt-2">
             <BadgeList>
-              {#each addedMembers as user}
+              {#each addedMembers as user (user.username)}
                 <OrgMemberBadge member={{ name: user.username, role: user.role }} />
               {/each}
             </BadgeList>
@@ -125,7 +125,7 @@
         {#if notFoundMembers.length > 0}
           <div class="mt-2">
             <BadgeList>
-              {#each notFoundMembers as user}
+              {#each notFoundMembers as user (user.username)}
                 <OrgMemberBadge member={{ name: user.username, role: user.role }} />
               {/each}
             </BadgeList>
@@ -139,7 +139,7 @@
         </p>
         <div class="mt-2">
           <BadgeList>
-            {#each existingMembers as user}
+            {#each existingMembers as user (user.username)}
               <OrgMemberBadge member={{ name: user.username, role: user.role }} />
             {/each}
           </BadgeList>
diff --git a/frontend/src/routes/(authenticated)/org/[org_id]/OrgMemberTable.svelte b/frontend/src/routes/(authenticated)/org/[org_id]/OrgMemberTable.svelte
index 8d8917367f..9b9a1c5f98 100644
--- a/frontend/src/routes/(authenticated)/org/[org_id]/OrgMemberTable.svelte
+++ b/frontend/src/routes/(authenticated)/org/[org_id]/OrgMemberTable.svelte
@@ -58,7 +58,7 @@
       </tr>
     </thead>
     <tbody>
-      {#each shownUsers as member}
+      {#each shownUsers as member (member.id)}
         {@const memberUser = member.user}
         {@const isOrgAdmin = member.role === OrgRole.Admin}
         <tr>
diff --git a/frontend/src/routes/(authenticated)/org/[org_id]/OrgTabs.svelte b/frontend/src/routes/(authenticated)/org/[org_id]/OrgTabs.svelte
index a1407dc910..cf8ebe09b1 100644
--- a/frontend/src/routes/(authenticated)/org/[org_id]/OrgTabs.svelte
+++ b/frontend/src/routes/(authenticated)/org/[org_id]/OrgTabs.svelte
@@ -34,7 +34,7 @@
 
 <div role="tablist" class="flex tabs tabs-lifted tabs-lg overflow-x-auto">
   <div class="tab tab-divider"></div>
-  {#each visibleTabs as tab}
+  {#each visibleTabs as tab (tab)}
     {@const isActiveTab = activeTab === tab}
     <button onclick={() => activeTab = tab} role="tab" class:tab-active={isActiveTab} class="tab grow flex-1 basis-1/2">
       <h2 class="text-lg flex gap-4 items-center">
diff --git a/frontend/src/routes/(authenticated)/org/list/+page.svelte b/frontend/src/routes/(authenticated)/org/list/+page.svelte
index b1832b38d2..46a09f628e 100644
--- a/frontend/src/routes/(authenticated)/org/list/+page.svelte
+++ b/frontend/src/routes/(authenticated)/org/list/+page.svelte
@@ -149,7 +149,7 @@ TODO:
               </tr>
             {/if}
           {/if}
-          {#each [...myOrgs, ...otherOrgs] as org, i}
+          {#each [...myOrgs, ...otherOrgs] as org, i (org.id)}
             {@const isFirstOtherOrg = i === myOrgs.length}
             {#if showingMyOrgsHeader && isFirstOtherOrg}
               <tr>
diff --git a/frontend/src/routes/(authenticated)/project/[project_code]/AddOrganization.svelte b/frontend/src/routes/(authenticated)/project/[project_code]/AddOrganization.svelte
index 12797e9814..d0d242d0e0 100644
--- a/frontend/src/routes/(authenticated)/project/[project_code]/AddOrganization.svelte
+++ b/frontend/src/routes/(authenticated)/project/[project_code]/AddOrganization.svelte
@@ -53,7 +53,7 @@
   {/snippet}
   {#snippet children({ errors })}
     <Select id="org" label={$t('project_page.organization.title')} bind:value={$form!.orgId} error={errors.orgId}>
-      {#each orgList as org}
+      {#each orgList as org (org.id)}
         <option value={org.id}>{org.name}</option>
       {/each}
     </Select>
diff --git a/frontend/src/routes/(authenticated)/project/[project_code]/AddPurpose.svelte b/frontend/src/routes/(authenticated)/project/[project_code]/AddPurpose.svelte
index 4fd9fb4940..f92b922f26 100644
--- a/frontend/src/routes/(authenticated)/project/[project_code]/AddPurpose.svelte
+++ b/frontend/src/routes/(authenticated)/project/[project_code]/AddPurpose.svelte
@@ -68,6 +68,6 @@
     </Select>
   {/snippet}
   {#snippet submitText()}
-    <span>{'Add Purpose'}</span>
+    <span>{$t('project_page.add_purpose.add_button')}</span>
   {/snippet}
 </FormModal>
diff --git a/frontend/src/routes/(authenticated)/project/[project_code]/BulkAddProjectMembers.svelte b/frontend/src/routes/(authenticated)/project/[project_code]/BulkAddProjectMembers.svelte
index 2b32f60886..0c8e35e431 100644
--- a/frontend/src/routes/(authenticated)/project/[project_code]/BulkAddProjectMembers.svelte
+++ b/frontend/src/routes/(authenticated)/project/[project_code]/BulkAddProjectMembers.svelte
@@ -144,7 +144,7 @@
           {#if addedMembers.length > 0}
             <div class="mt-2">
               <BadgeList>
-                {#each addedMembers as user}
+                {#each addedMembers as user (user.username)}
                   <MemberBadge member={{ name: user.username, role: user.role }} />
                 {/each}
               </BadgeList>
@@ -159,7 +159,7 @@
           {#if createdMembers.length > 0}
             <div class="mt-2">
               <BadgeList>
-                {#each createdMembers as user}
+                {#each createdMembers as user (user.username)}
                   <MemberBadge member={{ name: user.username, role: user.role }} />
                 {/each}
               </BadgeList>
@@ -173,7 +173,7 @@
           </p>
           <div class="mt-2">
             <BadgeList>
-              {#each existingMembers as user}
+              {#each existingMembers as user (user.username)}
                 <MemberBadge member={{ name: user.username, role: user.role }} />
               {/each}
             </BadgeList>
diff --git a/frontend/src/routes/(authenticated)/project/create/+page.svelte b/frontend/src/routes/(authenticated)/project/create/+page.svelte
index a9485be059..a37266a24c 100644
--- a/frontend/src/routes/(authenticated)/project/create/+page.svelte
+++ b/frontend/src/routes/(authenticated)/project/create/+page.svelte
@@ -238,8 +238,8 @@
       <ProjectTypeSelect bind:value={$form.type} error={$errors.type} />
 
       <Select id="org" label={$t('project.create.org')} bind:value={$form.orgId} error={$errors.orgId}>
-        <option value={''}>{$t('project_page.organization.placeholder')}</option>
-        {#each myOrgs as org}
+        <option value="">{$t('project_page.organization.placeholder')}</option>
+        {#each myOrgs as org (org.id)}
           <option value={org.id}>{org.name}</option>
         {/each}
       </Select>
@@ -300,7 +300,7 @@
             <div class="legend" id="label-extra-projects">
               {$t('project.create.maybe_related')}
             </div>
-            {#each relatedProjects.current as proj}
+            {#each relatedProjects.current as proj (proj.id)}
               <div class="form-control w-full">
                 <label class="label cursor-pointer justify-normal pb-0">
                   <input
diff --git a/frontend/src/routes/(unauthenticated)/register/+page.svelte b/frontend/src/routes/(unauthenticated)/register/+page.svelte
index 4f18eb7d07..10cccabcc1 100644
--- a/frontend/src/routes/(unauthenticated)/register/+page.svelte
+++ b/frontend/src/routes/(unauthenticated)/register/+page.svelte
@@ -13,7 +13,7 @@
 
 <TitlePage title={$t('register.title')}>
   <div class="flex flex-col pb-2">
-    <RegisterWithGoogleButton href={`/api/login/google`}/>
+    <RegisterWithGoogleButton href="/api/login/google"/>
   </div>
   <div class="divider lowercase">{$t('common.or')}</div>
   <CreateUser handleSubmit={register} onSubmitted={onSubmit} />
diff --git a/frontend/src/routes/+error.svelte b/frontend/src/routes/+error.svelte
index bb50a26901..2e8a5aad5b 100644
--- a/frontend/src/routes/+error.svelte
+++ b/frontend/src/routes/+error.svelte
@@ -9,7 +9,7 @@
 
 {#if page.data.user}
   <HomeBreadcrumb />
-  {#each page.url.pathname.split('/').slice(1) as path}
+  {#each page.url.pathname.split('/').slice(1) as path, i (i)}
     <PageBreadcrumb>{path}</PageBreadcrumb>
   {/each}
 {/if}
diff --git a/frontend/src/routes/email/tester/+page@.svelte b/frontend/src/routes/email/tester/+page@.svelte
index 0319b1cc4f..dfde105fe5 100644
--- a/frontend/src/routes/email/tester/+page@.svelte
+++ b/frontend/src/routes/email/tester/+page@.svelte
@@ -132,7 +132,7 @@
 <label class="label cursor-pointer inline-flex gap-4 m-4">
   <span class="label-text">Email template:</span>
   <select class="select select-info" bind:value={currEmail}>
-    {#each emails as email}
+    {#each emails as email, i (i)}
       <option value={email}>{email.label ?? email.template.replaceAll(/([a-z])([A-Z])/g, '$1 $2')}</option>
     {/each}
   </select>
diff --git a/frontend/svelte.config.js b/frontend/svelte.config.js
index 7ce916aa7f..cb0ec7e3cd 100644
--- a/frontend/svelte.config.js
+++ b/frontend/svelte.config.js
@@ -5,7 +5,6 @@ import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';
 const config = {
   compilerOptions: {
     warningFilter: (warning) => warning.code != 'element_invalid_self_closing_tag',
-    enableSourcemap: true
   },
   onwarn: (warning, handler) => {
     // eslint-plugin-svelte needs its own warning filter, duplicating the one from compilerOptions
diff --git a/frontend/viewer/eslint.config.js b/frontend/viewer/eslint.config.js
index a2918fe5d8..9db20ea3fe 100644
--- a/frontend/viewer/eslint.config.js
+++ b/frontend/viewer/eslint.config.js
@@ -154,14 +154,4 @@ export default [
     },
   },
   ...storybook.configs["flat/recommended"],
-  {
-    // TEMPORARY IGNORES, to be gotten rid of as soon as possible - 2025-07-24 RM
-    files: ['**/*.svelte', '**/*.svelte.ts'],
-    rules: {
-      'svelte/require-each-key': 'off',
-      'svelte/no-useless-mustaches': 'off',
-      'svelte/prefer-svelte-reactivity': 'off',
-      'svelte/no-unused-props': 'off',
-    },
-  },
 ];
diff --git a/frontend/viewer/src/home/HomeView.svelte b/frontend/viewer/src/home/HomeView.svelte
index a656c0dc91..b829cb1643 100644
--- a/frontend/viewer/src/home/HomeView.svelte
+++ b/frontend/viewer/src/home/HomeView.svelte
@@ -190,7 +190,7 @@
               </ButtonListItem>
             {/each}
             <DevContent>
-              <ButtonListItem href={`/testing/project-view`}>
+              <ButtonListItem href="/testing/project-view">
                 <ProjectListItem icon="i-mdi-test-tube" project={{ name: 'Test Project', code: 'Test Project' }}>
                   {#snippet actions()}
                     <Icon icon="i-mdi-chevron-right" class="p-2"/>
diff --git a/frontend/viewer/src/home/Server.svelte b/frontend/viewer/src/home/Server.svelte
index f8b5800b1d..ef16a0d233 100644
--- a/frontend/viewer/src/home/Server.svelte
+++ b/frontend/viewer/src/home/Server.svelte
@@ -104,7 +104,7 @@
       </p>
     {:else}
       <div class="shadow rounded">
-        {#each projects as project}
+        {#each projects as project (project.id)}
           {@const localProject = matchesProject(localProjects, project)}
           {#if localProject?.crdt}
             <ButtonListItem href={`/project/${project.code}`}>
diff --git a/frontend/viewer/src/home/ServersList.svelte b/frontend/viewer/src/home/ServersList.svelte
index 25504b69a3..c3516a6a3d 100644
--- a/frontend/viewer/src/home/ServersList.svelte
+++ b/frontend/viewer/src/home/ServersList.svelte
@@ -55,7 +55,7 @@
 {#await serversPromise}
   <Server status={undefined} projects={[]} localProjects={[]} loading={true}/>
 {:then serversStatus}
-  {#each serversStatus as status}
+  {#each serversStatus as status (status.server.id)}
     {@const server = status.server}
     {@const serverProjects = remoteProjects[server.id]?.filter(p => p.crdt) ?? []}
     <Server {status}
diff --git a/frontend/viewer/src/lib/DictionaryEntry.svelte b/frontend/viewer/src/lib/DictionaryEntry.svelte
index 184c56f362..40ee798684 100644
--- a/frontend/viewer/src/lib/DictionaryEntry.svelte
+++ b/frontend/viewer/src/lib/DictionaryEntry.svelte
@@ -93,6 +93,7 @@
   {:else}
     <span class="font-bold">{index + 1}</span>
   {/if}
+  <!-- eslint-disable-next-line svelte/no-useless-mustaches This mustache is not useless, it preserves whitespace -->
   {' · '}
 {/snippet}
 
@@ -102,6 +103,7 @@
   </div>
   <strong class="mr-1">
     {#each headwords as headword, i (headword.wsId)}
+      <!-- eslint-disable-next-line svelte/no-useless-mustaches This mustache is not useless, it preserves whitespace -->
       {#if i > 0}{' / '}{/if}
       <span class={headword.color}>{headword.value}</span>
     {/each}
@@ -123,11 +125,12 @@
         {#if glossAndDef.definition}
           <span class={glossAndDef.color}>{glossAndDef.definition}</span>
         {/if}
+        <!-- eslint-disable-next-line svelte/no-useless-mustaches This mustache is not useless, it is deliberately an empty string with no whitespace -->
         {''}
       {/each}
     </span>
     {#each sense.exampleSentences as example (example.id)}
-      {#each example.sentences as sentence, j}
+      {#each example.sentences as sentence, j (sentence)}
         {@const first = j === 0}
         {@const last = j === example.sentences.length - 1}
         {#if j > 0};{/if}
diff --git a/frontend/viewer/src/lib/components/reorderer/reorderer-item-list.svelte b/frontend/viewer/src/lib/components/reorderer/reorderer-item-list.svelte
index 27459283e5..8cf5240e7b 100644
--- a/frontend/viewer/src/lib/components/reorderer/reorderer-item-list.svelte
+++ b/frontend/viewer/src/lib/components/reorderer/reorderer-item-list.svelte
@@ -41,7 +41,7 @@
 </script>
 
 <DropdownMenu.Group {...mergedProps}>
-  {#each displayItems as item, i}
+  {#each displayItems as item, i (item)}
     {@const reorderName = getDisplayName(item) || '–'}
     <DropdownMenu.Item class="grid grid-cols-subgrid col-span-full justify-items-start items-center"
       onmouseover={() => displayIndex = i}
diff --git a/frontend/viewer/src/lib/entry-editor/EntryOrSensePicker.svelte b/frontend/viewer/src/lib/entry-editor/EntryOrSensePicker.svelte
index 95041cf0ae..8419a01f63 100644
--- a/frontend/viewer/src/lib/entry-editor/EntryOrSensePicker.svelte
+++ b/frontend/viewer/src/lib/entry-editor/EntryOrSensePicker.svelte
@@ -215,7 +215,7 @@
               </Badge>
             {/if}
           </ListItem>
-          {#each selectedEntry.senses as sense}
+          {#each selectedEntry.senses as sense (sense.id)}
             {@const disabledSense = disableSense?.(sense, selectedEntry)}
             <SenseRow
               {sense}
diff --git a/frontend/viewer/src/lib/entry-editor/ItemList.svelte b/frontend/viewer/src/lib/entry-editor/ItemList.svelte
index 3081133714..0deb60fdfa 100644
--- a/frontend/viewer/src/lib/entry-editor/ItemList.svelte
+++ b/frontend/viewer/src/lib/entry-editor/ItemList.svelte
@@ -20,7 +20,7 @@
 </script>
 
 <div class="flex gap-2 flex-wrap items-center">
-  {#each items as item, index}
+  {#each items as item, index (item)}
     <ItemListItem
       {item}
       {index}
diff --git a/frontend/viewer/src/lib/entry-editor/ItemListItem.svelte b/frontend/viewer/src/lib/entry-editor/ItemListItem.svelte
index 3e3d0378bb..bc90f377cd 100644
--- a/frontend/viewer/src/lib/entry-editor/ItemListItem.svelte
+++ b/frontend/viewer/src/lib/entry-editor/ItemListItem.svelte
@@ -23,12 +23,18 @@
 
   let {
     item,
+    // TODO: Either use `index` or remove it as a prop
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    index,
     items = $bindable(),
     readonly,
     orderable = false,
     getDisplayName,
     onchange,
     menuItems,
+    // TODO: Either use `actions` or remove it as a prop
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    actions,
   } : ItemListItemProps<T> = $props();
 
   const displayName = $derived(getDisplayName(item) || '–');
diff --git a/frontend/viewer/src/lib/entry-editor/NewEntryDialog.svelte b/frontend/viewer/src/lib/entry-editor/NewEntryDialog.svelte
index d309d5e758..bca8591e68 100644
--- a/frontend/viewer/src/lib/entry-editor/NewEntryDialog.svelte
+++ b/frontend/viewer/src/lib/entry-editor/NewEntryDialog.svelte
@@ -101,7 +101,7 @@
     </OverrideFields>
     {#if errors.length}
       <div class="text-end space-y-2">
-        {#each errors as error}
+        {#each errors as error (error)}
           <p class="text-destructive">{error}</p>
         {/each}
       </div>
diff --git a/frontend/viewer/src/lib/i18n/LocalizationPicker.svelte b/frontend/viewer/src/lib/i18n/LocalizationPicker.svelte
index 7afd93be16..8fa17883b7 100644
--- a/frontend/viewer/src/lib/i18n/LocalizationPicker.svelte
+++ b/frontend/viewer/src/lib/i18n/LocalizationPicker.svelte
@@ -28,7 +28,7 @@
   </DropdownMenu.Trigger>
   <DropdownMenu.Content>
     <DropdownMenu.RadioGroup bind:value={() => $locale, l => setLanguage(l)}>
-      {#each Object.entries(languages) as [lang, label]}
+      {#each Object.entries(languages) as [lang, label] (lang)}
         <DropdownMenu.RadioItem class="cursor-pointer" value={lang}>{label}</DropdownMenu.RadioItem>
       {/each}
     </DropdownMenu.RadioGroup>
diff --git a/frontend/viewer/src/lib/sandbox/EditorSandbox.svelte b/frontend/viewer/src/lib/sandbox/EditorSandbox.svelte
index 48e6184cb1..01a7fb60b3 100644
--- a/frontend/viewer/src/lib/sandbox/EditorSandbox.svelte
+++ b/frontend/viewer/src/lib/sandbox/EditorSandbox.svelte
@@ -76,6 +76,7 @@
   }
 </script>
 
+<!-- eslint-disable svelte/no-useless-mustaches - This is a sandbox, we don't need translations -->
 <ResizablePaneGroup direction="horizontal">
   <ResizablePane class="!overflow-visible" defaultSize={75}>
     <Editor.Root class="my-4 border px-4 py-8 relative z-0">
diff --git a/frontend/viewer/src/lib/sandbox/Sandbox.svelte b/frontend/viewer/src/lib/sandbox/Sandbox.svelte
index dfe93093aa..86912fb249 100644
--- a/frontend/viewer/src/lib/sandbox/Sandbox.svelte
+++ b/frontend/viewer/src/lib/sandbox/Sandbox.svelte
@@ -191,7 +191,7 @@
                         mode={pickerMode}
                         pick={(e) => selectedEntryHistory.push(e)}/>
     <div>
-      {#each selectedEntryHistory as selected}
+      {#each selectedEntryHistory as selected (selected.entry.id)}
         <p>
           Entry: {writingSystemService.headword(selected.entry)}
           {#if selected.sense}
@@ -322,16 +322,16 @@
       </div>
       <div><Button onclick={testLoading}>Test loading</Button></div>
       <div class="flex gap-2 flex-wrap">
-        {#each variants as variant}
+        {#each variants as variant (variant)}
           <Button loading={buttonsLoading} {variant}>{variant} button</Button>
         {/each}
-        {#each variants as variant}
+        {#each variants as variant (variant)}
           <Button loading={buttonsLoading} {variant} icon="i-mdi-auto-fix"></Button>
         {/each}
-        {#each sizes as size}
+        {#each sizes as size (size)}
           <Button loading={buttonsLoading} {size}>Size: {size}</Button>
         {/each}
-        {#each sizes as size}
+        {#each sizes as size (size)}
           <Button loading={buttonsLoading} {size} icon="i-mdi-auto-fix"/>
         {/each}
       </div>
diff --git a/frontend/viewer/src/lib/utils/url.svelte.ts b/frontend/viewer/src/lib/utils/url.svelte.ts
index 3f62181831..b3d0668a2c 100644
--- a/frontend/viewer/src/lib/utils/url.svelte.ts
+++ b/frontend/viewer/src/lib/utils/url.svelte.ts
@@ -1,4 +1,4 @@
-import {createSubscriber} from 'svelte/reactivity';
+import {createSubscriber, SvelteURL} from 'svelte/reactivity';
 import {queueHistoryChange} from './history';
 import {useLocation} from 'svelte-routing';
 
@@ -39,7 +39,7 @@ export class QueryParamState {
     this.#waitingForHistoryChange = true;
     await queueHistoryChange(() => {
       try {
-        const currentUrl = new URL(document.location.href);
+        const currentUrl = new SvelteURL(document.location.href);
         if (isDefault) {
           currentUrl.searchParams.delete(this.config.key);
         } else {
@@ -95,7 +95,7 @@ export class QueryParamState {
   }
 
   private readUrlValue(): string {
-    return new URL(document.location.href).searchParams.get(this.config.key) ?? this.defaultValue;
+    return new SvelteURL(document.location.href).searchParams.get(this.config.key) ?? this.defaultValue;
   }
 }
 
diff --git a/frontend/viewer/src/project/ProjectDropdown.svelte b/frontend/viewer/src/project/ProjectDropdown.svelte
index 913188eabd..9ced5b95ed 100644
--- a/frontend/viewer/src/project/ProjectDropdown.svelte
+++ b/frontend/viewer/src/project/ProjectDropdown.svelte
@@ -107,7 +107,7 @@
           </Command.Loading>
         {:else}
           <Command.Empty>{$t`No Dictionaries found`}</Command.Empty>
-          {#each projectsResource.current ?? [] as project}
+          {#each projectsResource.current ?? [] as project (project.id)}
             <Command.Item
               value={project.name + project.crdt}
               onSelect={() => handleSelect(project)}
diff --git a/frontend/viewer/src/project/browse/EntryView.svelte b/frontend/viewer/src/project/browse/EntryView.svelte
index 048de3df60..8b66ea73b7 100644
--- a/frontend/viewer/src/project/browse/EntryView.svelte
+++ b/frontend/viewer/src/project/browse/EntryView.svelte
@@ -68,7 +68,7 @@
     <DictionaryEntry {entry} showLinks class={cn('rounded bg-muted/80 dark:bg-muted/50 p-4')}>
       {#snippet actions()}
         <Toggle bind:pressed={() => sticky, (value) => dictionaryPreview = value ? 'sticky' : 'show'}
-          aria-label={`Toggle pinned`} class="aspect-square" size="xs">
+          aria-label={$t`Toggle pinned`} class="aspect-square" size="xs">
           <Icon icon="i-mdi-pin-outline" class="size-5" />
         </Toggle>
       {/snippet}
diff --git a/frontend/viewer/src/project/browse/SortMenu.svelte b/frontend/viewer/src/project/browse/SortMenu.svelte
index b943231781..d7851975e9 100644
--- a/frontend/viewer/src/project/browse/SortMenu.svelte
+++ b/frontend/viewer/src/project/browse/SortMenu.svelte
@@ -42,6 +42,9 @@
   let {
     value = $bindable(),
     autoSelector,
+    // TODO: Either use `autoDirection` or remove it as a prop
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    autoDirection,
   }: Props = $props();
 
   let selectedSortField = $state<SortField>();
@@ -75,7 +78,7 @@
           ({$t(sortLabels[autoSort])})
         </span>
     </ResponsiveMenu.Item>
-    {#each sortOptions as option}
+    {#each sortOptions as option (option)}
       {@const icon = sortIcons[option.field]?.[option.dir]}
       <ResponsiveMenu.Item
         onSelect={() => {
diff --git a/frontend/viewer/src/project/browse/ViewPicker.svelte b/frontend/viewer/src/project/browse/ViewPicker.svelte
index 139c62f3a2..ba2770bb89 100644
--- a/frontend/viewer/src/project/browse/ViewPicker.svelte
+++ b/frontend/viewer/src/project/browse/ViewPicker.svelte
@@ -30,7 +30,7 @@
   <div class="space-y-2 md:space-y-4">
     <RadioGroup.Root bind:value={getCurrentView, setCurrentView}>
       <h3 class="font-normal max-md:mb-1">{$t`Field Labels`}</h3>
-      {#each views as view}
+      {#each views as view (view.id)}
         <RadioGroup.Item value={view.id} label={view.label} />
       {/each}
     </RadioGroup.Root>
diff --git a/frontend/viewer/src/project/browse/filter/OpFilter.svelte b/frontend/viewer/src/project/browse/filter/OpFilter.svelte
index 307e03a8f8..f2cdc1866e 100644
--- a/frontend/viewer/src/project/browse/filter/OpFilter.svelte
+++ b/frontend/viewer/src/project/browse/filter/OpFilter.svelte
@@ -24,7 +24,7 @@
   <Select.Content>
     <Select.Group>
       <Select.GroupHeading>Filter By</Select.GroupHeading>
-      {#each ops as op}
+      {#each ops as op (op.value)}
         <Select.Item value={op.value}>
           <Icon icon={op.icon} class="mr-2"/>
           {op.label}
diff --git a/frontend/viewer/src/project/browse/filter/WsSelect.svelte b/frontend/viewer/src/project/browse/filter/WsSelect.svelte
index b45931b143..82bc5a2f99 100644
--- a/frontend/viewer/src/project/browse/filter/WsSelect.svelte
+++ b/frontend/viewer/src/project/browse/filter/WsSelect.svelte
@@ -27,7 +27,7 @@
   <Select.Content>
     <Select.Group>
       <Select.GroupHeading>{$t`Writing Systems`}</Select.GroupHeading>
-      {#each writingSystems as ws}
+      {#each writingSystems as ws (ws.id)}
         <Select.Item value={ws.wsId}>
           {ws.abbreviation} ({ws.wsId})
         </Select.Item>
diff --git a/frontend/viewer/src/stories/editor/misc/entry-picker.stories.svelte b/frontend/viewer/src/stories/editor/misc/entry-picker.stories.svelte
index e1701b73a1..45afb0c1e0 100644
--- a/frontend/viewer/src/stories/editor/misc/entry-picker.stories.svelte
+++ b/frontend/viewer/src/stories/editor/misc/entry-picker.stories.svelte
@@ -43,7 +43,7 @@
   </div>
 
   <div>
-    {#each selectedEntryHistory as selected}
+    {#each selectedEntryHistory as selected (selected.entry.id)}
       <p>
         Entry: {writingSystemService?.headword(selected.entry)}
         {#if selected.sense}
diff --git a/frontend/viewer/src/stories/editor/misc/reorderer.stories.svelte b/frontend/viewer/src/stories/editor/misc/reorderer.stories.svelte
index 6d3e4e9e4f..42298ec1da 100644
--- a/frontend/viewer/src/stories/editor/misc/reorderer.stories.svelte
+++ b/frontend/viewer/src/stories/editor/misc/reorderer.stories.svelte
@@ -36,7 +36,7 @@
 </div>
 
 <code>
-  {#each items as item}
+  {#each items as item (item)}
     <span class={cn('p-2 inline-block', item === currentItem && 'text-primary font-bold')}>
       {displayFunc(item)}
     </span>
diff --git a/frontend/viewer/src/stories/primitives/button.stories.svelte b/frontend/viewer/src/stories/primitives/button.stories.svelte
index aed032f26e..2c6bed672b 100644
--- a/frontend/viewer/src/stories/primitives/button.stories.svelte
+++ b/frontend/viewer/src/stories/primitives/button.stories.svelte
@@ -30,7 +30,7 @@
       <div>
         Variants:
         <div class="flex gap-2 flex-wrap">
-          {#each variants as variant}
+          {#each variants as variant (variant)}
             <Button {variant} {...args}>{variant} button</Button>
           {/each}
         </div>
@@ -38,7 +38,7 @@
       <div>
         Variants with icon:
         <div class="flex gap-2 flex-wrap">
-          {#each variants as variant}
+          {#each variants as variant (variant)}
             <Button {variant} icon="i-mdi-auto-fix" {...args}></Button>
           {/each}
         </div>
@@ -46,7 +46,7 @@
       <div>
         Sizes:
         <div class="flex gap-2 flex-wrap">
-          {#each sizes as size}
+          {#each sizes as size (size)}
             <Button {size} {...args}>{size}</Button>
           {/each}
         </div>
@@ -54,7 +54,7 @@
       <div>
         Sizes with icon:
         <div class="flex gap-2 flex-wrap">
-          {#each sizes as size}
+          {#each sizes as size (size)}
             <Button {size} icon="i-mdi-auto-fix" {...args} />
           {/each}
         </div>