perf(app): defer settings panels from startup

[Itsnotaka]

What changed

• Lazily load all nine settings panel modules while keeping the settings frame, rail, header, and close control eager.
• Render a token-backed fallback using the existing settings row geometry so the permanent dialog structure stays fixed while a panel chunk loads.
• Add a development startup graph gate and an opt-in Electron ready-to-show probe.
• Document the performance review, static UI boundary, measurements, and non-goals.

Why

The closed Settings overlay was statically importing every panel into the renderer startup graph. Those controls are unavailable until Settings opens, and only one panel is visible at a time.

Impact

• Electron dev process-to-ready median: 8,365 ms → 7,849 ms (-6.17%)
• Electron dev window-to-ready median: 7,433 ms → 6,932 ms (-6.74%)
• Production initial renderer JS: 3,133,697 B → 3,041,442 B (-2.94%)
• V8 initial-module compile median: 37.43 ms → 35.60 ms (-4.89%)
• Eager app source in the dev graph: 1,663.1 KiB → 1,527.9 KiB (-8.1%)

The first visit to a settings panel pays one local dynamic import. Subsequent visits use the module cache. Build configuration, allocators, and permanent startup UI are unchanged.

Validation

• pnpm --filter @honk/app dev:startup-review
• pnpm --filter @honk/desktop typecheck
• pnpm --filter @honk/desktop test (76 passed)
• pnpm --filter @honk/desktop build
• React Doctor on changed files (100/100)
• Focused oxlint and formatting checks

The full app typecheck, app test suite, architecture check, and design lint retain failures reproduced on a clean baseline checkout: the missing gearColossus icon type, three StyleX debug-class assertions, five existing oversized files, and existing raw-style findings in v2.tsx.

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Project	Deployment	Actions	Updated (UTC)
honk-marketing	Ready	Preview	Aug 4, 2026 4:42pm

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