chore(cleanup): frontend — drop stale narrative comments (current-standard)

Comment-only: removed a dated KI mistake-narrative on the tts_error_code
type and trimmed a few "old hack / used to" history parentheticals in
page.tsx / globals.css to clean current-behaviour wording. No TS/JSX/CSS
behaviour change. Completes the codebase-wide stale-content purge
(history of record stays in ADR/KI/README only).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/app/globals.css

@@ -662,8 +662,8 @@ body {
 /* #47 — larger continuous slider variant for the merged Profile &
  * premium money fields. Bigger track + thumb so the touch target clears
  * the 44px guideline on phones (the wrapper row + thumb hit-area). */
-/* Padding gives the ≥44px touch target; the track is now a pseudo-element
- * so padding no longer hides it (the old height/background-clip hack did). */
+/* Padding gives the ≥44px touch target; the track is a pseudo-element so
+ * the padding does not hide it. */
 .app-range-lg { padding: 13px 0; }
 .app-range-lg::-webkit-slider-runnable-track { height: 8px; }
 .app-range-lg::-moz-range-track { height: 8px; }

frontend/src/app/page.tsx

@@ -4316,10 +4316,9 @@ function SafeLink({ href, children, className, fallbackClassName }: {
 
 // Jargon — inline component that wraps a term and shows an info popover
 // on click with a plain-language explanation. Bilingual via uiLang.
-// #50 — the "?" explainer is HOVER-only (and keyboard-focus for a11y):
-// it appears while you hover/focus the badge and disappears when you stop.
-// No click, no × close (clicking several used to leave them all stuck open,
-// overflowing across cards). The tooltip is width-constrained, sits ABOVE
+// The "?" explainer is HOVER-only (and keyboard-focus for a11y): it
+// appears while you hover/focus the badge and disappears when you stop.
+// No click, no × close. The tooltip is width-constrained, sits ABOVE
 // the badge centered, and is pointer-events-none so it never blocks or
 // thrashes. Scoped group/jg so only the badge — not the whole label —
 // triggers it.
@@ -5723,9 +5722,8 @@ function PolicyDetailModal({ policy, onClose }: { policy: MarketplacePolicy; onC
           </div>
 
           {/* 2 — SCORE (always rendered in this position; tri-state so a
-              slow/failed scorecard fetch shows loading/Retry, never a silent
-              gap where the whole "how this score was calculated" section
-              used to disappear). */}
+              slow/failed scorecard fetch shows loading/Retry, never a
+              silent gap). */}
           <div className="pt-5 border-t border-[var(--border)]">
             <PanelEyebrow>How this policy scores {isPersonalized ? "for you" : "(generic buyer)"}</PanelEyebrow>
             {sc === undefined && (

frontend/src/lib/api.ts

@@ -31,12 +31,9 @@ export type ChatResponse = {
   // frontend uses this when constructing the playback Blob URL so Safari
   // doesn't refuse to play an mp4 payload labelled as wav.
   audio_mime?: string | null;
-  // KI-278 (2026-05-16) — voice-OUTPUT (TTS) failures used to be silent:
-  // the bot returned a text reply with audio_base64=null and NO signal,
-  // so the user saw a voice-less answer with zero explanation ("no voice
-  // in reply. wtf?"). The backend now classifies the failure (closed enum,
-  // same contract as the STT path) and ships a user-facing message the
-  // chat UI renders inline under the bubble. Absent on the success path.
+  // Closed-enum TTS failure code. When voice output fails the backend
+  // classifies it (same contract as the STT path) and ships a user-facing
+  // message the chat UI renders inline under the bubble. Absent on success.
   tts_error_code?:
     | "rate_limit"
     | "service_unavailable"