fix: Fix corrupted view redirect, workspace cache flash and diff collapse

[charlesvien]

1. Redirect to task input when task-detail view has no data or taskId
2. Optimistically update workspace cache on task create/open to prevent setup screen flash
3. Collapse unchanged lines in session diff viewer with 3-line margin
4. Replace direct ${{ steps.version.outputs.version }} interpolation in run: block with APP_VERSION env var
5. Fixed the sidebars per-folder plus button not pre-selecting the correct repo

[charlesvien]

• fix: Reduce agent eagerness to re-enter plan mode mid-task #1208
• feat: Scope oauth tokens by org, replace flat project list with org-keyed map #1210
• feat: Add multi-agent command center grid view #1212
• feat: Add effort level control for Claude sessions #1211
• feat: Optimistically render conversation items before subscription confirms #1209
• feat: Add idle timeout to kill inactive sessions after 15 minutes #1207
• fix: Fix corrupted view redirect, workspace cache flash and diff collapse #1206 👈 (View in Graphite)
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