exceptionless
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@@ -2,6 +2,12 @@
 
 This project features an **ASP.NET Core** backend (REST API) and a **Svelte 5 TypeScript** frontend (SPA).
 
+## Key Principles
+
+All contributions must respect existing formatting and conventions specified in the `.editorconfig` file. You are a distinguished engineer and are expected to deliver high-quality code that adheres to the guidelines in the instruction files.
+
+Let's keep pushing for clarity, usability, and excellence—both in code and user experience.
+
 ## Instructions Organization
 
 This project uses modular instruction files for better organization and targeted guidance. The instructions are organized as follows:
@@ -16,9 +22,3 @@ This project uses modular instruction files for better organization and targeted
 - **[Frontend Svelte Testing](instructions/frontend-svelte-testing.instructions.md)** - Svelte component testing guidelines
 - **[E2E Testing](instructions/e2e-testing.instructions.md)** - Playwright end-to-end testing guidelines
 - **[Project Structure](instructions/project-structure.instructions.md)** - Understanding the codebase organization
-
-## Key Principles
-
-All contributions must respect existing formatting and conventions specified in the `.editorconfig` file. You are a distinguished engineer and are expected to deliver high-quality code that adheres to the guidelines in the instruction files.
-
-Let's keep pushing for clarity, usability, and excellence—both in code and user experience.
@@ -20,8 +20,7 @@ applyTo: "tests/**/*.cs"
 
 - Write complete, runnable tests—no placeholders or TODOs.
 - Use clear, descriptive naming conventions for test methods:
-  - `MethodName_StateUnderTest_ExpectedBehavior`
-  - `Should_ExpectedBehavior_When_StateUnderTest`
+    - `MethodName_StateUnderTest_ExpectedBehavior`
 - Follow AAA pattern (Arrange, Act, Assert).
 
 ## Test Organization
 
@@ -13,7 +13,6 @@ applyTo: "**/*.cs"
 ## Conventions & Best Practices
 
 - Adhere to the `.editorconfig` file and Microsoft's [coding conventions](https://learn.microsoft.com/en-us/dotnet/csharp/fundamentals/coding-style/coding-conventions).
-- Follow Microsoft's [unit testing best practices](https://learn.microsoft.com/en-us/dotnet/core/testing/unit-testing-best-practices).
 
 ## Architectural Considerations
 
 
@@ -13,6 +13,142 @@ applyTo: "src/Exceptionless.Web/ClientApp/**/*.svelte"
 - Use `import { page } from '$app/state'` instead of `'$app/stores'`
 - Use snippets `{#snippet ...}` and `{@render ...}` instead of `<slot>` for content projection.
 
+## Asynchronous Components (Experimental)
+
+**Available in Svelte 5.36+ with experimental.async compiler option**
+
+You can now use `await` directly in three places:
+- At the top level of a component `<script>`
+- In a `$derived` expression
+- In template expressions (markup)
+
+## Form Handling with Superforms
+
+Always supply a unique, stable `id` option for every `superForm` instance (e.g. `id: 'login'`, `id: 'update-user'`, `id: 'invite-user'`). Missing ids lead to duplicate form data warnings when multiple forms (including dialogs) are present. Use short, kebab-case resource-action names and never reuse the same id on the same page.
+
+### Safe Data Cloning Pattern
+Always use the `structuredCloneState()` utility when initializing forms and resetting form data to prevent cache mutation and reactive entanglement:
+
+```svelte
+import { structuredCloneState } from '$features/shared/utils/state';
+
+// Form initialization - use structuredCloneState utility
+const form = superForm(defaults(structuredCloneState(settings) || new NotificationSettings(), classvalidatorClient(NotificationSettings)), {
+    // form options...
+});
+
+// Form reset in $effect - use structuredCloneState utility
+$effect(() => {
+    if (!$submitting && !$tainted && settings !== previousSettingsRef) {
+        const clonedSettings = structuredCloneState(settings);
+        form.reset({ data: clonedSettings, keepMessage: true });
+        previousSettingsRef = settings;
+    }
+});
+```
+
+### Reactive Binding Pattern
+For simple reactive bindings to query data, you can override derived values for binding:
+
+```svelte
+// Derived value that can be temporarily overridden for binding
+let emailNotificationsEnabled = $derived(meQuery.data?.email_notifications_enabled ?? false);
+
+// Sync the derived value when source data changes
+$effect(() => {
+    emailNotificationsEnabled = meQuery.data?.email_notifications_enabled ?? false;
+});
+```
+
+```svelte
+<!-- Direct binding works - temporarily overrides derived value -->
+<Switch bind:checked={emailNotificationsEnabled} />
+```
+
+**Note:** This pattern uses Svelte 5's ability to override derived values (available since v5.25). The derived value automatically recalculates when dependencies change, but can be temporarily overridden for UI binding. The `$effect` ensures the local state resyncs when the source data changes.
+
+### Superforms onUpdate Pattern for Dialogs
+
+When using `superForm` inside dialogs, always use the following `onUpdate` pattern to ensure server-side validation errors are applied and dialogs don't close prematurely. This also prevents SvelteKit from stealing focus on success.
+
+```svelte
+const form = superForm(defaults(new MyForm(), classvalidatorClient(MyForm)), {
+    dataType: 'json',
+    id: 'my-form-id',
+    async onUpdate({ form, result }) {
+        if (!form.valid) {
+            return;
+        }
+
+        try {
+            await doAction(form.data);
+
+            open = false;
+
+            // HACK: Prevent SvelteKit from stealing focus
+            result.type = 'failure';
+        } catch (error: unknown) {
+            if (error instanceof ProblemDetails) {
+                applyServerSideErrors(form, error);
+                result.status = error.status ?? 500;
+            } else {
+                result.status = 500;
+            }
+        }
+    },
+    SPA: true,
+    validators: classvalidatorClient(MyForm)
+});
+```
+
+Requirements:
+- Import and use `ProblemDetails` from `@exceptionless/fetchclient` and `applyServerSideErrors` from `$features/shared/validation`.
+- Close the dialog with `open = false` only after the action succeeds.
+- Set `result.type = 'failure'` after success to avoid focus theft.
+
+### Dialog Action Functions Must Rethrow
+
+When passing action functions into dialogs (e.g., `save`, `suspend`, `setBonus`), if you display a toast in a `catch` block, you must rethrow the error so the dialog’s `onUpdate` handler can catch it and apply server-side validation errors.
+
+Example:
+
+```ts
+async function setBonus(params: PostSetBonusOrganizationParams) {
+    toast.dismiss(toastId);
+    try {
+        await setOrganizationBonus.mutateAsync(params);
+        toast.success('Successfully set the organization bonus.');
+    } catch (error) {
+        const message = error instanceof ProblemDetails ? error.title : 'Please try again.';
+        toast.error(`An error occurred while trying to set the organization bonus: ${message}`);
+        throw error; // critical: propagate to form
+    }
+}
+```
+
+### Why These Patterns?
+- **Prevents Cache Mutation**: `structuredCloneState()` creates independent copies that don't affect cached data
+- **Reactive Safety**: Uses `$state.snapshot()` internally for non-reactive snapshots, preventing unintended dependencies
+- **Form Isolation**: Each form gets its own copy of data, preventing cross-contamination
+- **Auto-Reset**: Local state automatically resets when source data changes
+- **Bindable**: Creates writable state for form controls and UI components
+- **Predictable Behavior**: Ensures consistent form state management across all scenarios
+- **Type Safety**: Utility provides proper TypeScript types and handles undefined/null gracefully
+
+### Reference Comparison for Resets
+Use object reference comparison instead of JSON stringification for performance:
+```svelte
+// ✅ Good - Reference comparison
+if (settings !== previousSettingsRef) {
+    // reset logic
+}
+
+// ❌ Avoid - JSON comparison (slower)
+if (JSON.stringify(settings) !== JSON.stringify(previousSettings)) {
+    // reset logic
+}
+```
+
 ## Event Handling
 
 - All single-line control statements must be enclosed in curly braces
@@ -24,6 +160,48 @@ applyTo: "src/Exceptionless.Web/ClientApp/**/*.svelte"
 - Use the Composite Component Pattern
 - Organize components within vertical slices aligned with API controllers
 
+## Dialog Component Patterns
+
+### Naming Conventions
+- Dialog state variables should use `open[ComponentName]Dialog` pattern (e.g., `openSuspendOrganizationDialog`, `openMarkStackDiscardedDialog`)
+- Avoid generic names like `showDialog` or `isOpen`
+
+### Event Handlers
+- Use inline arrow functions for opening dialogs: `onclick={() => (openDialogName = true)}`
+- Avoid creating separate handler functions just to set state to true
+- Create separate async functions only for complex operations (API calls, validation, etc.)
+
+### Conditional Rendering
+- Always wrap dialogs in `{#if}` blocks: `{#if openDialogName} <Dialog /> {/if}`
+- This prevents unnecessary DOM creation and improves performance
+
+### API Integration
+- Import and use existing interface types from API files (e.g., `SuspendOrganizationParams`)
+- Don't create inline types when proper interfaces exist
+- Create options files following the `DropdownItem<EnumType>[]` pattern in `options.ts`
+
+### Example Pattern
+```svelte
+<script lang="ts">
+    import type { ApiParamsInterface } from '$features/module/api.svelte';
+    import { optionsArray } from '$features/module/options';
+
+    let openMyActionDialog = $state(false);
+
+    async function performAction(params: ApiParamsInterface) {
+        // API call logic here
+    }
+</script>
+
+<Button onclick={() => (openMyActionDialog = true)}>
+    Action Label
+</Button>
+
+{#if openMyActionDialog}
+    <MyActionDialog bind:open={openMyActionDialog} action={performAction} />
+{/if}
+```
+
 ## Accessibility
 
 - Ensure excellent keyboard navigation for all interactions