test: wait for completed navigation before opening menus

Require the actual message article to own focus instead of matching body text. Wait for project runtime initialization before opening dismiss-on-blur composer options. Preserve all capture and native command assertions. Complete frozen Linux snapshot: 5371 passed, 51 skipped; focused Windows, typecheck and lint passed.

tests/support/magic-notes-capture-main.ts

@@ -110,7 +110,7 @@ app.whenReady().then(async () => {
     await wait(`Boolean(document.getElementById('magic-note-entry-${captured.id}'))`, 'full workspace exact entry')
     evidence.workspaceOpened = true
     await click('View source message', `document.getElementById('magic-note-entry-${captured.id}')`)
-    await wait('document.activeElement?.textContent?.includes("CAPTURE_HISTORY_501_END")', 'source message focus')
+    await wait('document.activeElement?.matches("article.message") && document.activeElement.textContent.includes("CAPTURE_HISTORY_501_END")', 'source message focus')
     evidence.sourceOpened = true
     await click('Conversation actions')
     await click('Save conversation to note')