Not in Archive Page: Keep all controls disabled for the full duration of a download

src/crystal/server/special_pages.py

@@ -759,7 +759,7 @@ def not_in_archive_html(
             </div>
 
             <div class="cr-page__actions">
-                <button onclick="history.back()" class="cr-button cr-button--secondary">
+                <button id="cr-back-button" onclick="history.back()" class="cr-button cr-button--secondary">
                     ← Go Back
                 </button>
                 <button id="cr-action-button" {'disabled ' if readonly else ''}onclick="onActionButtonClicked()" class="cr-button cr-button--primary">⬇ Download</button>
@@ -1043,14 +1043,9 @@ def not_in_archive_html(
                 const name = document.getElementById('cr-root-url-name').value.trim();
 
                 clearActionMessage();
-                setActionInProgress(true);
-
-                try {
-                    // Start individual URL download (which will create the root URL automatically)
-                    await startUrlDownload(/*isRoot=*/true, /*rootName=*/name);
-                } finally {
-                    setActionInProgress(false);
-                }
+                // Start individual URL download (which will create the root URL automatically).
+                // NOTE: startUrlDownload() manages setActionInProgress() internally.
+                await startUrlDownload(/*isRoot=*/true, /*rootName=*/name);
             }
 
             // -----------------------------------------------------------------
@@ -1070,6 +1065,7 @@ def not_in_archive_html(
                 clearActionMessage();
                 setActionInProgress(true);
 
+                let downloadStarted = false;
                 try {
                     const createUrl = '/_/crystal/create-group';
                     const response = await fetch(createUrl, {
@@ -1100,6 +1096,8 @@ def not_in_archive_html(
                     // If download was requested, start individual URL download
                     // otherwise collapse the disabled form to show only essential elements
                     if (downloadGroupImmediately) {
+                        downloadStarted = true;
+                        // NOTE: startUrlDownload() manages setActionInProgress() internally.
                         await startUrlDownload(/*isRoot=*/false, /*rootName=*/'');
                     } else {
                         collapseCreateGroupForm();
@@ -1108,7 +1106,9 @@ def not_in_archive_html(
                     console.error('Group action error:', error);
                     showActionMessage('✖️ Failed to create group', /*isSuccess=*/false);
                 } finally {
-                    setActionInProgress(false);
+                    if (!downloadStarted) {
+                        setActionInProgress(false);
+                    }
                 }
             }
 

src/crystal/tests/test_server.py

@@ -997,6 +997,36 @@ def pw_task(raw_page: RawPage, *args, **kwargs) -> None:
         await pw.run(pw_task)
 
 
+@awith_playwright
+async def test_given_nia_page_when_download_starts_then_all_controls_except_go_back_button_are_disabled(pw: Playwright) -> None:
+    async with _not_in_archive_page_visible_temporarily() as (comic1_url_in_archive, *_):
+        def pw_task(raw_page: RawPage, *args, **kwargs) -> None:
+            page = NotInArchivePage.open(raw_page, url_in_archive=comic1_url_in_archive)
+
+            # Verify all controls are initially enabled
+            expect(page.action_button).to_be_enabled()
+            expect(page.go_back_button).to_be_enabled()
+
+            with reloads_paused(raw_page):
+                # Start download (default action type: Create Root URL)
+                page.action_button.click()
+
+                # Wait for progress bar to appear, which means the server has
+                # acknowledged the download request and it is now in progress
+                page.progress_bar.wait_for(state='visible')
+
+                # Verify all controls are disabled while download is in progress
+                expect(page.create_root_url_radio).to_be_disabled()
+                expect(page.create_group_radio).to_be_disabled()
+                expect(page.download_only_radio).to_be_disabled()
+                expect(page.root_url_name_field).to_be_disabled()
+                expect(page.action_button).to_be_disabled()
+
+                # Verify the "← Go Back" button is still enabled
+                expect(page.go_back_button).to_be_enabled()
+        await pw.run(pw_task)
+
+
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
 # Test: "Not in Archive" Page: Create Group
 

src/crystal/tests/util/pages.py

@@ -127,6 +127,10 @@ def download_group_immediately_checkbox(self) -> Locator:
 
     # === Action Button ===
 
+    @property
+    def go_back_button(self) -> Locator:
+        return self.raw_page.locator('#cr-back-button')
+
     @property
     def action_button(self) -> Locator:
         return self.raw_page.locator('#cr-action-button')