## Why
Synchronous auth header construction could silently return no credentials when managed authentication became unavailable. Callers need an error to avoid sending requests with missing or partial authentication.
## What changed
- Make `AuthProvider::add_auth_headers`, `to_auth_headers`, and auth header telemetry fallible, and propagate failures through request and WebSocket setup.
- Return a transient error when managed authentication is unavailable, and preserve network policy denials through auth error conversion.
- Retry transient MCP authentication errors while treating build errors and policy denials as terminal.
- Cancel local MCP event streams before resolving authentication so cleanup still works when credentials become unavailable.
## Testing
Add regression coverage for rejected partial authentication, async header resolution, terminal auth errors without sending requests, managed account changes, MCP retry classification, and local stream cancellation after authentication becomes unavailable.
GitOrigin-RevId: 39d981e232cba1e302de502a2fa6239101114ed1
## Why
Consumer analytics lacked a per-chat view of allowance usage and balance credit debits.
## What changed
- Add a Top chats panel for up to 100 local chats active in the past 30 days, including discovered descendants and excluding archived roots.
- Show weekly and five-hour usage as percentages of current full limits, plus balance credits including adjustments. Preserve exact credit decimals and distinguish missing values from zero.
- Support cycling sort metrics with `s`, a top-five dashboard summary, and expandable model, reasoning effort, and speed breakdowns.
- Query task usage through `query_v2` with bounded, disjoint descendant groups. Retain partial and unavailable rows, hide titles when usage is unavailable, and report ranking coverage and freshness.
## Testing
Add backend and TUI tests covering decimal precision, request and response validation, paginated archived descendants, unavailable responses, metric selection, title hiding, and top-five rendering.
GitOrigin-RevId: b8f233166576389c8212bb97eceb7c6be7f5f51d
cooper-oai