feat(tui): display count of modified files in session

[ErvisTusha]

This feature adds a count display for files modified during the current session in the TUI sidebar under the "Modified Files" section.
Changes

• packages/opencode/src/cli/cmd/tui/routes/session/sidebar.tsx: Updated the display logic to show the count of session-modified files, making the expandable UI available when there are multiple files.
  Technical Details
• Leverages existing session_diff data to count modified files
• Maintains the expandable UI for better user experience with multiple modifications
• Integrates seamlessly with the existing sidebar layout
  This provides users with immediate visibility into how many files have been modified in their current session.

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

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[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Based on my search, I found one potentially related PR that involves similar sidebar display functionality:

• PR feat: display Anthropic and OpenAI OAuth usage in status dialog and sidebar #6905: "feat: display Anthropic and OpenAI OAuth usage in status dialog and sidebar"
  • This PR also focuses on adding display information to the sidebar, though it's for OAuth usage metrics rather than modified file counts. It uses similar patterns of updating sidebar display logic.

However, this appears to be addressing a different feature (OAuth usage vs. modified file counts). The current PR #7857 appears to be unique in its specific focus on displaying a count of session-modified files.

No duplicate PRs found