fix(i18n): keep English pixel-identical and stored data English

From the English-parity and breakage review against main:
- English wording back to main: "Configured Source", the "SHARED SUBJECT"
  fallback, CCTV calibration "RANGE 120m".
- Voice header and CCTV calibration chip/select tweaks for long labels now
  apply to non-English only (html:not([lang='en'])); English matches main.
  The scene select font change is scoped the same way.
- New scenes and shots store their default title in English ("Scene 3",
  "Shot 2") and translate it when shown, so a title captured in one language
  does not leak into projects, storage or shared JSON.
- Choosing a language with storage blocked keeps it in ?lang instead of
  silently doing nothing.
- One picked import file shows its name again.
- qa-l9-matrix reads the voice state from data-status, not the label.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/ui/shellFeedback.js

@@ -139,15 +139,14 @@ export class ShellFeedback {
     // the flap keeps textContent equal to the settled label throughout, so
     // this stays a no-op on the repeat ticks exactly as it did before.
     if (presentation.label)
-      if (presentation.label)
-        setSplitFlapText(
-          this._trafficSyncLabel,
-          localizeStatusLabel(presentation.label),
-          {
-            // Completion is a timing signal, not another animated loading stage.
-            immediate: !presentation.busy,
-          },
-        );
+      setSplitFlapText(
+        this._trafficSyncLabel,
+        localizeStatusLabel(presentation.label),
+        {
+          // Completion is a timing signal, not another animated loading stage.
+          immediate: !presentation.busy,
+        },
+      );
     // Written on every change INCLUDING the empty settled value — the reducer
     // clears the progress number once the sync lands, and a truthiness guard
     // here would strand the last "..." beside the settled label.