fix(desktop): compile annotation CSS in the preload bundler

[t3-code]

Desktop annotation styles are compiled into a tracked TypeScript file before bundling. That can leave a dirty tree after a build, and the one-shot generation step does not refresh CSS during watch rebuilds.

Compile the stylesheet through a Vite+ Pack plugin instead. The preview preload imports a typed virtual module whose CSS remains embedded in the sandboxed preload bundle. Watch dependencies include the annotation CSS, preload class candidates, and Tailwind theme/preflight inputs; each load uses a fresh compiler so removed utilities disappear.

Remove the old generator and tracked output. Ignore the exact legacy output path and remove any leftover file at build start, so builds from older checkouts cannot supply stale CSS or leave an untracked generated file behind. Normal Git protections for local modifications still apply when switching branches; this does not force checkout or reset user changes.

#17838 has merged. This follow-up is rebased on main and replaces the refreshed tracked stylesheet with build-time compilation.

verification

• Focused bundler integration tests pass: legacy-file cleanup and watch rebuilds after CSS and preload edits, including utility removal.
• Built the real preview preload through vp pack --filter preview-pick-preload using Vite+ 1.0.0 and Tailwind 4.3.3.
• Embedded CSS is byte-identical to the existing generator's regenerated output. No virtual-module runtime require remains.
• Reintroduced the old generated file, confirmed it is ignored, built the real preload, and verified cleanup with unchanged Git status.
• Targeted lint, strict typechecking of the plugin/tests, and git diff --check pass.
• No full desktop packaging, Electron launch, or macOS/Windows local run performed.

requested by @mwolson. co-author credit included.

model: gpt-6.1-sol. harness: hermes agent.

[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — The PR moves annotation CSS generation into the production Electron preload bundler and adds watch-aware integration coverage, while preserving the existing runtime injection path. Human review is warranted because the new bundler and test files suppress a static-analysis diagnostic.

Notes:

• All code in this push has already been reviewed. Approvability was decided on eligibility alone.

^{You can add or adjust custom eligibility rules. Learn more.}

[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	4.9 KiB	4.9 KiB	0 B (0.0%)	6.8 KiB	✅
Codex	Thread snapshot wire	3.8 KiB	3.8 KiB	0 B (0.0%)	4.9 KiB	✅
Codex	Live turn WebSocket wire	1.2 KiB	1.2 KiB	0 B (0.0%)	2.0 KiB	✅
Codex	Live turn WebSocket decoded	20.8 KiB	20.8 KiB	0 B (0.0%)	29.3 KiB	✅
Codex	Live turn messages	1	1	0 (0.0%)	8	✅
Claude	Total thread wire	5.0 KiB	5.0 KiB	0 B (0.0%)	6.8 KiB	✅
Claude	Thread snapshot wire	3.8 KiB	3.8 KiB	0 B (0.0%)	4.9 KiB	✅
Claude	Live turn WebSocket wire	1.2 KiB	1.2 KiB	0 B (0.0%)	2.0 KiB	✅
Claude	Live turn WebSocket decoded	21.2 KiB	21.2 KiB	0 B (0.0%)	29.3 KiB	✅
Claude	Live turn messages	2	2	0 (0.0%)	8	✅

Baseline: e7db61f · PR result: ecd60b4 · 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: 108.5 KiB
• Claude decoded thread snapshot: 108.8 KiB

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

Dismissing prior approval to re-evaluate c50ab39

[t3-code]

The two nodeBuiltinImport exemptions are scoped to bundler hooks and their filesystem integration fixtures. These run outside an Effect runtime, matching the existing build-bootstrap exemption in scripts/lib/public-config.ts; no repo-wide diagnostic setting changed. The current-head CI and correctness check pass, and the real preview preload bundles with CSS identical to the previous generator output. Leaving the build integration and these exemptions for human review, as requested by the approvability check.