refactor(tui): /clean pass across ui-tui — 49 files, −217 LOC

Full codebase pass using the /clean doctrine (KISS/DRY, no one-off
helpers, no variables-used-once, pure functional where natural,
inlined obvious one-liners, killed dead exports, narrowed types,
spaced JSX). All contracts preserved — no RPC method, event name,
or exported type shape changed.

app/ — 15 files, -134 LOC
- inlined 4 one-off helpers (titleCase, isLong, statusToneFrom,
  focusOutside predicate)
- stores to arrow-const style (buildUiState, buildTurnState,
  buildOverlayState plus get/patch/reset triplets)
- functional slash/registry byName map (flatMap over for-loops)
- dropped dead param `live` in cancelOverlayFromCtrlC
- DRY'd duplicate shift() call in scrollWithSelection
- consolidated sections.push calls in /help

components/ — 12 files, -40 LOC
- extracted inline prop types to interfaces at file bottom (13×)
- inlined 6 one-off vars (pctLabel, logoW, heroW, cwd, title, hint)
- promoted HEART_COLORS + OPTS/LABELS to module scope
- JSX sibling spacing across 9 files
- un-shadowed `raw` in textInput
- components/thinking.tsx + components/markdown.tsx untouched
  (structurally load-bearing / edge-case-heavy)

config content domain protocol/ — 8 files, -77 LOC
- tightened 3 regexes (MOUSE_TRACKING, looksLikeSlashCommand,
  hasInterpolation — dropped stateful lastIndex dance)
- dead export ParsedSlashCommand removed
- MODES narrowed to `as const`, `.find(m => m === s)` replaces
  `.includes() ? (as cast) : null`
- fortunes.ts hash via reduce
- fmtDuration ternary chain
- inlined aboveViewport predicate in viewport.ts

hooks/ + lib/ — 9 files, -38 LOC
- ANSI_RE via String.fromCharCode(27) + WS_RE lifted to module
  scope (no more eslint-disable no-control-regex)
- compactPreview/edgePreview/thinkingPreview → ternary arrows
- useCompletion: hoisted pathReplace, moved stale-ref guard earlier
- useInputHistory: dropped useCallback wrapper (append is stable)
- useVirtualHistory: replaced 4× any with unknown + narrow
  MeasuredNode interface + one cast site

root TS — 3 files, -63 LOC
- banner.ts: parseRichMarkup via matchAll instead of exec/lastIndex,
  artWidth via reduce
- gatewayClient.ts: resolvePython candidate list collapse, inlined
  one-branch guards in dispatch/pushLog/drain/request
- types.ts: alpha-sorted ActiveTool / Msg / SudoReq / SecretReq
  members

eslint config
- disabled react-hooks/exhaustive-deps on packages/hermes-ink/**
  (compiled by react/compiler, deps live in $[N] memo arrays that
  eslint can't introspect) and removed the now-orphan in-file
  disable directive in ScrollBox.tsx

fixes (not from the cleaner pass)
- useComposerState: unlinkSync(file) + try/catch → rmSync(file,
  { force: true }) — kills the no-empty lint error and is more
  idiomatic
- useConfigSync: added setBellOnComplete + setVoiceEnabled to the
  two useEffect dep arrays (they're stable React setState setters;
  adding is safe and silences exhaustive-deps)

verification
- npx eslint src/ packages/ → 0 errors, 0 warnings
- npm run type-check → clean
- npm test → 50/50
- npm run build → 394.8kb ink-bundle.js, 11ms esbuild
- pytest tests/tui_gateway/ tests/test_tui_gateway_server.py
  tests/hermes_cli/test_tui_resume_flow.py
  tests/hermes_cli/test_tui_npm_install.py → 57/57

ui-tui/src/app/useMainApp.ts

@@ -170,18 +170,16 @@ export function useMainApp(gw: GatewayClient) {
       }
 
       const sel = selection.getState() as null | SelectionSnap
+      const top = s.getViewportTop()
+      const bottom = top + s.getViewportHeight() - 1
 
-      const focusOutside = (top: number, bottom: number) =>
+      if (
         !sel?.anchor ||
         !sel.focus ||
         sel.anchor.row < top ||
         sel.anchor.row > bottom ||
         (!sel.isDragging && (sel.focus.row < top || sel.focus.row > bottom))
-
-      const top = s.getViewportTop()
-      const bottom = top + s.getViewportHeight() - 1
-
-      if (focusOutside(top, bottom)) {
+      ) {
         return s.scrollBy(delta)
       }
 
@@ -197,12 +195,11 @@ export function useMainApp(gw: GatewayClient) {
 
       if (actual > 0) {
         selection.captureScrolledRows(top, top + actual - 1, 'above')
-        shift(-actual, top, bottom)
       } else {
         selection.captureScrolledRows(bottom + actual + 1, bottom, 'below')
-        shift(-actual, top, bottom)
       }
 
+      shift(-actual, top, bottom)
       s.scrollBy(delta)
     },
     [selection]