fix: adapt edit-message-github-diff test to sidebar reorganization

[empiricalrun]

Summary

This PR fixes the failing test edit message twice, wait for str_replace tool, and verify single commit via GitHub API in tests/edit-message-github-diff.spec.ts which broke due to sidebar reorganization changes on the claude/slack-add-sidenav-grouping branch.

Root Cause

The sidebar reorganization removed the workspace-specific "Sessions" link, leaving only one global "Sessions" link. Additionally, the session URL format changed from path-based (/sessions/77894) to query-based (/sessions?id=77894).

Changes Made

1. Line 15: Removed .nth(1) from Sessions link selector since there's now only one Sessions link in the sidebar

   // Before
   await page.getByRole('link', { name: 'Sessions', exact: true }).nth(1).click();
   
   // After  
   await page.getByRole('link', { name: 'Sessions', exact: true }).click();

2. Line 21-22: Updated the new session button selector - the "+" button no longer has an accessible name, so we use a positional selector

   // Note: The "+" button doesn't have an accessible name, so we use positional selector
   await page.getByRole('button').nth(5).click();

3. Line 27: Updated the URL assertion to match both old and new URL formats

   // Before
   await expect(page).toHaveURL(/sessions\//, { timeout: 10000 });
   
   // After (matches /sessions/ID or /sessions?id=ID)
   await expect(page).toHaveURL(/sessions(\?id=|\/)\d+/, { timeout: 10000 });

Test Results

✅ Test passes after changes: Report URL

The test completes successfully in ~85 seconds and correctly:

• Navigates to Sessions page
• Creates a new session with initial prompt
• Waits for tool execution
• Edits message and verifies single commit via GitHub API

Related

• Failed Test Run: #45744 (Jan 22, 07:55 UTC)
• Last Successful Run before changes: #45666 (Jan 21, 18:44 UTC)
• Build: claude/slack-add-sidenav-grouping branch

PR created from session #72258

^{Updated at 2026-01-22 08:20:34.259 UTC}