fix(server): resume checkpointing after git init

[Yash-Singh1]

Prevents this error from happening on a turn after git init

What Changed

• Resume checkpointing after a project is initialized as a Git repository.
• Add focused error guards, startup handling, and regression coverage across server, desktop, web, and mobile code.
• Improve mobile review diff virtualization, streaming highlighting, relay URL normalization, and pending environment status handling.

Why

Checkpointing could stop after Git initialization, preventing subsequent turns from being captured reliably. This restores checkpointing once repository setup completes and hardens related cross-surface behavior with targeted tests.

UI Changes

• No intentional visual redesigns.
• Mobile review rendering now supports flattened virtualized rows and streamed syntax highlighting.

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

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[macroscopeapp]

Approvability

Verdict: Approved at b42778e

Macroscope's review found this PR approvable — This is a focused checkpointing bug fix that preserves existing behavior when a baseline exists and safely records checkpoints when Git is initialized mid-flow. Regression coverage exercises the affected lifecycle paths and confirms subsequent turn diffs resume normally.

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[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	13.6 KiB	13.6 KiB	+5 B (+0.0%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.0 KiB	7.0 KiB	+3 B (+0.0%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.6 KiB	6.6 KiB	+2 B (+0.0%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	57.1 KiB	57.1 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	10	10	0 (0.0%)	21	✅
Claude	Total thread wire	13.5 KiB	13.6 KiB	+17 B (+0.1%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.0 KiB	7.0 KiB	−3 B (−0.0%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.5 KiB	6.5 KiB	+20 B (+0.3%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	57.8 KiB	57.8 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	8	8	0 (0.0%)	21	✅

Baseline: ab0933a · PR result: b42778e · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 113.8 KiB
• Claude decoded thread snapshot: 114.5 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.