Add Issues navigation and normalize issue board statuses

[0xroylee]

Summary

• Added Issues to the default chat-room sidebar and shared workspace navigation so the main sessions view can jump directly to /issues.
• Split the chat sidebar footer nav into a small dedicated component to keep the sidebar file within size limits.
• Updated the issues board to present the requested status set (backlog, todo, running, in_review, done, canceled) and normalize legacy task statuses into those columns.
• Normalized issue detail editor drafts so existing tasks open with the new board vocabulary.
• Added focused coverage for sidebar navigation and issue-board status normalization.

Why

• The default sessions sidebar needed a direct path to the issues task board.
• The board UI was still exposing legacy status wording, which no longer matched the requested workflow columns.

How to Test

• Run the web unit tests for navigation and issue-board utilities.
• Run bun run --filter web typecheck and bun run --filter web build.
• Open the app locally, click Issues from the sessions sidebar, and confirm /issues renders the six status columns in order.

Additional Notes

• Kept the existing backend/task status contract intact by normalizing legacy values in the web layer.
• Browser verification covered both desktop and mobile sidebar layouts.