fix: stop working timer when agent is awaiting user input

[rdoupe]

What Changed

Two locations showed stale "Working" state after the agent finished:

1. ChatView.tsx — "Working for Xm Xs" timer in the main chat area
2. Sidebar.logic.ts — "Working" pill on thread list items

Both checked only session.status === "running" to decide whether to show the working state.

Why

The server can lag in transitioning session.status away from "running" even after the latest turn has a completedAt timestamp. This caused:

• The main chat timer to keep counting after Claude finished responding
• The sidebar pill to keep showing "Working" after the turn completed
• Both to keep showing even when the agent was blocked waiting for user input (via AskUserQuestion)

Fix: suppress working state when latestTurn.completedAt is set (turn is done, regardless of server status lag), or when pendingUserInputs.length > 0 (agent is waiting on the user, not actively working).

// ChatView.tsx - was a single line, now accounts for both cases:
const isActivelyRunning =
  phase === "running" &&
  pendingUserInputs.length === 0 &&
  !activeLatestTurn?.completedAt;
const isWorking = isActivelyRunning || isSendBusy || isConnecting || isRevertingCheckpoint;

// Sidebar.logic.ts - added completedAt guard:
if (thread.session?.status === "running" && !thread.latestTurn?.completedAt) { ... }

UI Changes

⚠️ Video pending — will add a before/after screen recording before marking ready for review.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Fixes #1069, closes #1335

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