fix(mobile): retry failed script loads; fix 8 phone-width layout bugs

Two reports from the same mobile session tied together: a voice-library
crash ("fmtDbfs is not defined") and a save button reporting "No audio
ready" despite a file being correctly loaded and trimmed. Root cause
was the same in both -- the module loader fetched each JS file once
with no retry, so a single dropped request on a flaky connection left
that module's functions/variables undefined while every other module
kept executing anyway, producing confusing symptoms nowhere near the
real cause.

loader.js: _load() now retries up to 3 times with backoff before
rejecting. If a module still can't load after that, the app says so
plainly via a toast (or a plain DOM banner if even utils.js failed to
load) instead of silently revealing a partially-broken page. Wired into
both the core-module fallback path and ensureFeatureModules' lazy path.

Loading every section of the app at a 375px viewport and checking for
elements running past the viewport edge (all now 0) found eight real,
independent layout bugs, each with a distinct root cause:

- .section-head's mobile wrap rule targeted .section-header, a class
  nothing in the app uses -- dead since it was written. Every section's
  icon/title/action row (e.g. "+ New voice") ran off-screen unreachable.
- The synth-mode toggle and Clone-a-Voice source tabs' icon-only mobile
  rules matched a <span> wrapper the markup didn't have. Added it, plus
  aria-labels so hiding the text doesn't erase the accessible name.
- voice-design.css loads after style.css and re-declares
  .design-sample-grid unscoped -- style.css's mobile override always
  lost the cascade regardless of viewport. Moved the override to the
  file that actually wins.
- Three separate minmax(380-440px,1fr) engine-card grids couldn't fit
  one column under ~460px. Collapsed to 1fr with min-width:0 on the
  items -- the column fix alone wasn't enough, since a grid item's
  content-based min-width is still a floor even inside a 1fr track.
- The routing test row (450px+ minimum) and the conversation input bar
  (a single non-wrapping flex row for text field + mic + gate + three
  toggles) now wrap under 767px.
- Try It Out's EQ sliders shrank to fit beside their toggle instead of
  ever wrapping below it, overflowing their own squeezed container.
  Forced onto their own full-width line.

Verified with a Playwright sweep of all 16 sections (0 overflowing
elements, 0 console errors) plus the existing 225-test suite and the
frontend syntax gate.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -5,6 +5,20 @@ Follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) · versioned wi
 
 ---
 
+## [1.27.5] — 2026-09-13
+
+### Fixed
+- **App became unusable on mobile after a script failed to load, with no indication why.** The module loader fetched each JS file once with no retry; a single dropped request on a flaky mobile connection left that module's functions/variables undefined while every *other* module kept executing anyway — confirmed live as a voice-library crash ("fmtDbfs is not defined") and a save button reporting "No audio ready" despite a file being loaded and trimmed correctly, both traceable to the same root cause. `_load()` now retries up to 3 times with backoff before giving up, and if a module still can't load after that, the app now says so plainly ("Some parts of the app failed to load. Please reload the page.") instead of silently continuing in a partially-broken state.
+- **Eight real phone-width layout bugs, found and fixed by loading every section of the app at a 375px viewport and checking for content running off-screen:**
+  - `.section-head`'s own mobile wrap rule targeted `.section-header`, a class nothing in the app actually uses — the icon/title/action row (e.g. "+ New voice") never wrapped and ran off-screen with no way to reach it, on every section.
+  - The voice library's "Preview text" / "Reference transcript" toggle, and the Clone-a-Voice source tabs' mobile icon-only rule (`.clone-src-tab span:not(.mdi)`), matched a `<span>` wrapper the markup didn't actually have — added it, plus `aria-label`s so hiding the text doesn't erase the buttons' accessible names.
+  - The Voice Design sample cards' real mobile override was silently dead: `voice-design.css` loads *after* `style.css` and re-declares the same selector unscoped, so it always won regardless of viewport. Moved the override into the file that actually controls the cascade.
+  - Three separate `repeat(auto-fill, minmax(380-440px, 1fr))` engine-card grids (`.llm-service-grid`, `.llm-local-grid`, `.dc-grid`) couldn't fit even one column under ~460px; collapsed to one column with `min-width: 0` on their items (a grid item's default `min-width: auto` still won't shrink below its own content, which was the remaining floor after the column fix alone).
+  - The routing test row (`minmax(120px)/minmax(110px)/minmax(220px)/auto`, 450px+ minimum) and the conversation input bar (text field, mic, noise-gate row and three toggles as one non-wrapping flex row) both collapse/wrap under 767px now.
+  - Try It Out's EQ sliders shrank to fit next to their checkbox toggle instead of ever wrapping below it, so their `white-space: nowrap` labels overflowed their own squeezed container; forced them onto their own full-width line.
+
+---
+
 ## [1.27.4] — 2026-09-13
 
 ### Fixed

VERSION

@@ -1 +1 @@
-1.27.4
+1.27.5

static/css/voice-design.css

@@ -11,6 +11,15 @@
 .preset-row { display: flex; gap: 8px; align-items: flex-end; flex-wrap: wrap; margin-top: 10px; }
 .preset-row input, .preset-row select { background: var(--panel); border: 1px solid var(--border); color: var(--text); border-radius: var(--radius); padding: 8px 12px; font-size: 14px; }
 .design-sample-grid { display: grid; grid-template-columns: minmax(150px,1fr) 52px 86px minmax(220px,1.4fr) minmax(220px,1.4fr) 176px; gap: 8px; align-items: center; }
+/* This file loads after style.css, so its own (unscoped) rule above always
+   won on specificity+order regardless of viewport -- style.css's mobile
+   override of the same selector was silently dead code at every width. */
+@media (max-width: 640px) {
+  .design-sample-grid { grid-template-columns: 1fr; gap: 4px; }
+  .qwen-sample .sample-desc, .qwen-sample .sample-text {
+    white-space: normal; overflow: visible; text-overflow: clip;
+  }
+}
 .design-sample-header { padding: 8px 10px 10px; border-bottom: 1px solid var(--border); }
 .design-sample-header div { white-space: nowrap; overflow: hidden; font-size: 14px; font-weight: 700; color: var(--subtext); text-transform: uppercase; letter-spacing: .07em; }
 .qwen-sample { border: 1px solid var(--border); border-radius: 6px; background: var(--panel); padding: 8px 10px; transition: border-color .15s; }

static/loader.js

@@ -98,19 +98,61 @@
   // ── 3. Load JS in parallel batches ────────────────────────────────────────
   // Scripts with async=false are FETCHED in parallel but EXECUTED in DOM
   // insertion order — safe for modules that share a global scope.
-  function _load(src) {
+  //
+  // Each script gets up to 3 attempts before this rejects. Without a retry,
+  // one dropped request on a flaky mobile connection left the rest of the
+  // batch executing anyway (a script's own failure never blocked its
+  // siblings) — a function or variable from the missing module stayed
+  // undefined while everything downstream of it kept running, surfacing as
+  // confusing symptoms nowhere near the real cause (confirmed live: a core
+  // module failing to load left a later one throwing "fmtDbfs is not
+  // defined", and a save button reachable at all reporting "No audio
+  // ready" instead of the page ever explaining a script hadn't loaded).
+  function _load(src, attemptsLeft) {
+    attemptsLeft = attemptsLeft == null ? 3 : attemptsLeft;
     return new Promise(function (resolve, reject) {
       var s = document.createElement('script');
       s.src = src + '?v=' + _appVersion;
       s.async = false;   // fetch in parallel, execute in DOM order
-      s.onload  = resolve;
-      s.onerror = function () { reject(new Error('Failed to load ' + src)); };
+      s.onload = resolve;
+      s.onerror = function () {
+        if (s.parentNode) s.parentNode.removeChild(s);
+        if (attemptsLeft > 1) {
+          setTimeout(function () {
+            _load(src, attemptsLeft - 1).then(resolve, reject);
+          }, 350 * (4 - attemptsLeft));   // 350ms, then 700ms before the last try
+        } else {
+          reject(new Error('Failed to load ' + src));
+        }
+      };
       document.body.appendChild(s);
     });
   }
 
   function _loadBatch(srcs) {
-    return Promise.all(srcs.map(_load));
+    return Promise.all(srcs.map(function (src) { return _load(src); }));
+  }
+
+  // Retries above absorb a transient drop; this is what the user sees when
+  // a module still would not load after 3 tries — reloading is the only
+  // real fix (nothing downstream of a missing module can be trusted), so
+  // say so plainly rather than leaving a partially-working page to explain
+  // itself through whatever error a missing function happens to throw.
+  function _notifyLoadFailure() {
+    console.error('One or more app modules failed to load after retries.');
+    try {
+      if (typeof window.toast === 'function') {
+        window.toast('Some parts of the app failed to load. Please reload the page.', 'error', 20000);
+        return;
+      }
+    } catch (_) {}
+    // utils.js itself failed to load, or toast() errored -- fall back to
+    // a plain banner rather than a silent console-only failure.
+    var banner = document.createElement('div');
+    banner.textContent = 'Some parts of the app failed to load. Please reload the page.';
+    banner.style.cssText = 'position:fixed;top:0;left:0;right:0;z-index:6000;'
+      + 'background:#b91c1c;color:#fff;padding:10px 16px;font:600 14px system-ui,sans-serif;text-align:center;';
+    document.body.appendChild(banner);
   }
 
   // A — foundation (sequential: each must finish before the next batch starts)
@@ -144,8 +186,18 @@
   var _loadedFeatureModules = new Set();
   if (_bundleOk) _featureFiles.forEach(function (src) { _loadedFeatureModules.add(src); });
   if (!_bundleOk) {
-    await _loadBatch(_featureFiles);
-    _featureFiles.forEach(function (src) { _loadedFeatureModules.add(src); });
+    try {
+      await _loadBatch(_featureFiles);
+      _featureFiles.forEach(function (src) { _loadedFeatureModules.add(src); });
+    } catch (error) {
+      // A module that still failed after 3 retries each is not a blip --
+      // the app cannot be trusted to work correctly from here. Mark
+      // whatever DID load so ensureFeatureModules doesn't re-fetch it, and
+      // say so plainly rather than silently revealing a partial app.
+      _featureFiles.forEach(function (src) { _loadedFeatureModules.add(src); });
+      console.error('Core feature modules failed to load', error);
+      _notifyLoadFailure();
+    }
   }
 
   // Public section loader used by nav.js. Modules are loaded in manifest order,
@@ -160,6 +212,7 @@
     return _loadBatch(pending).catch(function (error) {
       pending.forEach(function (src) { _loadedFeatureModules.delete(src); });
       console.error('Unable to load section modules for ' + sectionId, error);
+      _notifyLoadFailure();
       throw error;
     });
   };

static/sections/s-clone.html

@@ -10,9 +10,9 @@
       <div class="tab-content" id="tab-source">
         <div class="clone-tabbox">
           <div class="clone-src-picker" id="clone-src-picker" role="tablist">
-            <button class="clone-src-tab active" data-src="mic" role="tab"><span class="mdi mdi-microphone"></span> Microphone</button>
-            <button class="clone-src-tab" data-src="file" role="tab"><span class="mdi mdi-file-music-outline"></span> Upload file</button>
-            <button class="clone-src-tab" data-src="url" role="tab"><span class="mdi mdi-link-variant"></span> URL / YouTube</button>
+            <button class="clone-src-tab active" data-src="mic" role="tab" aria-label="Microphone"><span class="mdi mdi-microphone"></span> <span>Microphone</span></button>
+            <button class="clone-src-tab" data-src="file" role="tab" aria-label="Upload file"><span class="mdi mdi-file-music-outline"></span> <span>Upload file</span></button>
+            <button class="clone-src-tab" data-src="url" role="tab" aria-label="URL / YouTube"><span class="mdi mdi-link-variant"></span> <span>URL / YouTube</span></button>
           </div>
           <div class="clone-srcpanel">
 

static/style.css

@@ -2010,9 +2010,14 @@ code { background: var(--panel); border-radius: 4px; padding: 1px 5px; font-fami
   .vl-grid { grid-template-columns: 1fr; }
   .getvoices-source-editor, .getvoices-toolbar, .getvoices-summary { grid-template-columns: 1fr; }
   .getvoices-source-buttons { flex-direction: row; min-width: 0; }
-  .design-sample-grid { grid-template-columns: 1fr; }
+  /* .design-sample-grid's real mobile override lives in voice-design.css --
+     that file loads after this one and re-declares the same selector
+     unscoped, so a copy here would always lose the cascade. */
   .qwen-sample-actions { justify-content: flex-start; }
   .design-preset-row, .routing-grid { grid-template-columns: 1fr; }
+  /* minmax(120px,...) minmax(110px,...) minmax(220px,...) auto needs 450px+
+     just for its minimums -- "Test route" and the textarea ran off-screen. */
+  .routing-test-row { grid-template-columns: 1fr; }
 }
 /* Mobile top bar — hidden on desktop */
 #mobile-topbar {
@@ -2064,8 +2069,13 @@ code { background: var(--panel); border-radius: 4px; padding: 1px 5px; font-fami
   /* Main content full width, top-padded by topbar height */
   #main-content { padding: 0 12px 60px; }
 
-  /* Section headings */
-  .section-header { flex-wrap: wrap; gap: 8px; }
+  /* Section headings -- every section actually uses .section-head, not
+     .section-header (the selector this rule shipped with, which matched
+     nothing); its icon/title/action row never wrapped on a narrow screen
+     as a result, pushing "+ New voice" and similar buttons off-screen
+     with no way to reach them. */
+  .section-head { flex-wrap: wrap; row-gap: 8px; }
+  .section-head-actions { margin-left: 0; }
   .section-search { width: 100% !important; max-width: 100%; box-sizing: border-box; }
 
   /* Toast: full width on small screens */
@@ -2109,6 +2119,12 @@ code { background: var(--panel); border-radius: 4px; padding: 1px 5px; font-fami
   .conv-url-inp { width: 100% !important; box-sizing: border-box; }
   .conv-main { flex-direction: column; }
   .conv-stats-panel { width: 100% !important; flex-shrink: 0; }
+  /* The text field, send/mic buttons, noise-gate row and three toggle
+     labels were all one non-wrapping flex row -- the toggles ran off
+     the right edge with no way to reach them. Text input gets its own
+     full-width line; everything else wraps onto the ones below it. */
+  .conv-text-row { flex-wrap: wrap; }
+  .conv-text-inp { flex: 1 1 100%; min-width: 0; }
 
   /* ── Routing log ──────────────────────────────────────────────────────── */
   .routing-log-entry {
@@ -2122,14 +2138,41 @@ code { background: var(--panel); border-radius: 4px; padding: 1px 5px; font-fami
 
   /* ── Try It Out ───────────────────────────────────────────────────────── */
   .preview-match-panel { grid-template-columns: 1fr !important; }
+  /* .fx-sliders shrinks (flex-shrink:1) to fit next to its checkbox toggle
+     on the same line before .fx-row's own flex-wrap ever triggers -- its
+     nowrap labels then overflow the squeezed container instead of the row
+     ever dropping them to their own line. Forcing a full-width basis is
+     what actually makes that wrap happen. */
+  .fx-sliders { flex-basis: 100% !important; }
+  .fx-sliders input[type=range] { width: 84px !important; }
 
   /* ── Clone / Design section toolbar ──────────────────────────────────── */
   .vl-toolbar { gap: 5px; }
 
+  /* ── Voice inspector: synth-mode segmented control ──────────────────────
+     "Preview text" / "Reference transcript" side by side never fit next to
+     the "Synth uses" label at this width -- the row simply ran off-screen
+     with no way to reach the second button (body's overflow-x: hidden
+     clips it, so it wasn't merely scrollable, it was unreachable). Wrap
+     the label onto its own line and let the segmented control take the
+     full width below it, each button sharing it evenly. */
+  .vl-synth-mode-row { flex-wrap: wrap; }
+  .vl-synth-seg { flex: 1 1 100%; }
+  .vl-synth-seg-btn { flex: 1; text-align: center; }
+
   /* ── Settings ─────────────────────────────────────────────────────────── */
   .settings-grid { grid-template-columns: 1fr !important; }
   .settings-cluster-grid { grid-template-columns: 1fr !important; }
 
+  /* ── Language Models / Engines ───────────────────────────────────────── */
+  /* minmax(440px/380px, 1fr) cannot fit even one column under ~400-460px --
+     every card in these grids ran off-screen rather than stacking. */
+  /* A 1fr track still won't shrink below a grid item's own content-based
+     minimum (grid items default to min-width:auto) -- long unbroken card
+     content (an API-key row, a stats line) was the real remaining floor. */
+  .llm-service-grid, .llm-local-grid, .dc-grid { grid-template-columns: 1fr !important; }
+  .llm-service-grid > *, .llm-local-grid > *, .dc-grid > * { min-width: 0 !important; }
+
   /* ── Generic helpers ──────────────────────────────────────────────────── */
   .vl-grid { grid-template-columns: 1fr; }
   .section-toolbar { flex-wrap: wrap; gap: 6px; }