fix: smooth "Working for" timer progression

[neriousy]

What Changed

Fixed the chat "Working for Xs" timer so it starts updating as soon as the working indicator is shown, instead of waiting for the thread to fully enter the running phase.

Why

The timer could sit at 0s for too long and then jump to 2s because the UI rendered the working state before the 1-second ticker started. This keeps the elapsed time display aligned with the actual visible working state and makes the interaction feel consistent.

UI Changes

No visible ui changes, just smoother "Working for..." experience

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

Note

Fix smooth timer progression for 'Working for' display in ChatView

The shouldTickNow flag in ChatView.tsx replaces the phase === 'running' check as the gate for the time-ticking effect. An immediate setNowTick(Date.now()) call is added before the interval starts, eliminating the 1-second delay before the timer first updates. The effect now also continues ticking when activeWorkStartedAt is set and the latest turn is not yet settled, covering cases where work has ended but the turn hasn't finalized.

^{Macroscope summarized a1e9935.}

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[Copilot]

Pull request overview

Improves the chat “Working for …” timer behavior so elapsed time starts updating immediately when the working indicator is shown, rather than waiting for the thread to reach the running phase.

Changes:

• Start the nowTick interval whenever work appears to be in progress (not just when phase === "running").
• Trigger an immediate nowTick update when ticking begins to avoid the initial “0s” stall.

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