feat(frontend): surface tracker intake controls

[anirudh5harma]

Summary

The dashboard now gives tracker intake a first-class surface instead of requiring raw project config edits. Project settings expose a structured Tracker intake card for enabling intake, setting repository overrides, labels, assignee rules, and per-poll limits, while session cards and the inspector make issue-linked sessions recognizable through their canonical issue id.

This is stacked on #424 because it uses the trackerIntake config schema and issueId session data added there.

Scope Notes

• The UI keeps intake read-only toward the tracker; it only edits project config and displays issue-linked sessions.
• Provider selection is pinned to the currently supported provider and can become a select once more providers exist.
• Matching previews, last-poll state, and intake pause/resume controls still need daemon read APIs and are intentionally left out.

Validation

• npm --prefix frontend test -- ProjectSettingsForm.test.tsx SessionInspector.test.tsx useWorkspaceQuery.test.tsx --run
• npm run frontend:typecheck
• npm --prefix frontend test -- --run
• npm --prefix frontend run build

[anirudh5harma]

Ported to the stacked destination draft AgentWrapper/agent-orchestrator#2289, which closes AgentWrapper/agent-orchestrator#2283 and depends on AgentWrapper/agent-orchestrator#2288. Closing this legacy draft.