feat(ui): support direct agent chat routes

[onutc]

Summary

• make /c/:name usable before ACP is ready by showing provisioning state, polling until ready, and starting a chat automatically
• when the route omits a conversation id, load the latest conversation if one exists or create a new one if it does not
• focus the routed agent in the sidebar, move it to the top, and collapse the other agent sections by default

Testing

• cd ui && pnpm test -- src/pages/chat.test.tsx src/components/acp/sidebar.test.tsx
• cd ui && pnpm typecheck

[gitrank-connector]

👍 GitRank PR Analysis

Score: 20 points

Metric	Value
Component	Other (1× multiplier)
Severity	P2 - Medium (20 base pts)
Final Score	20 × 1 = 20

Eligibility Checks

Check	Status
Issue/Bug Fix	❌
Fix Implementation	✅
PR Documented	✅
Tests	✅
Lines Within Limit	✅

Impact Summary

The PR enables direct agent chat routes via /c/:name by adding provisioning state display, automatic polling until readiness, and automatic conversation creation/selection. It enhances the sidebar to focus routed agents at the top and collapse other sections. The implementation includes comprehensive test coverage for the new routing and sidebar behaviors.

Analysis Details

Component Classification: This PR affects UI chat routing and sidebar components without fitting neatly into a single categorized component, making OTHER the appropriate classification.

Severity Justification: This is a P2 (Medium) severity contribution as it implements a functional feature enhancement (direct agent chat routes with provisioning state) that improves user experience but doesn't fix a critical bug or security issue.

Eligibility Notes: Tests are required and included: 89 new lines in sidebar.test.tsx and 193 new lines in chat.test.tsx covering provisioning states, conversation selection, auto-creation, and sidebar focus behavior. The PR is well-documented with clear description of changes. No reported issue is referenced, but this is a feature implementation rather than a bug fix. The fix_implementation check passes as code changes align with the feature description.

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