chore(tui): /clean recent perf work — KISS/DRY pass
24 files, -319 LoC. Behaviour preserved, 369/369 tests green.
- hermes-ink caches: shared lruEvict helper for the four parallel LRU
caches (stringWidth, wrapText, sliceAnsi, lineWidth); touch-on-read
stays inlined per cache; tightened output.ts skip-slice fast path.
- wheelAccel: trimmed provenance header, collapsed env parsing, ternary
dispatch in computeWheelStep.
- perfPane: folded ensureLogDir into once-flag, spread-with-overrides
for fastPath/phases instead of full rebuilds.
- env: extracted truthy() (used 4×).
- virtualHeights: collapsed user/diff/slash height bumps; trail+todos
estimate.
- useInputHandlers: scrollIdleTimer cleanup on unmount, ?? undefined
shorthand.
- useMainApp: dropped dead liveTailVisible IIFE and liveProgress
indirection.
- appLayout, markdown, messageLine, entry: vertical rhythm, dropped
narration comments, inlined one-shot vars.
- fix: empty catch blocks → /* best-effort */ for no-empty lint.
b1c49d5e73