feat(studio): central error helpers + inline log viewer + Today CTAs

Bundles the error-UX overhaul and the inline log viewer:

  - New `FaiLog` (`~/.fai/logs/studio-errors.log`, 256 KiB rotation,
    JSON-per-line). Every operator-visible failure is appended so
    `fai admin doctor` and the new viewer can show the trail
    without the operator having to reproduce the failure.
  - New `showFaiErrorSnack` / `showFaiErrorDialog` helpers wrap
    `FaiErrorBox` in copyable surfaces; 27 ad-hoc
    `SnackBar(content: Text(e.toString()))` sites swept to use
    them (settings, doctor, audit, store, module sheet, system-AI
    editor, flow output).
  - New `FaiLogViewer` modal (`showFaiLogViewer`) renders log
    files inline with line numbers, JSON-key + `[level]` token
    colouring, Copy-all, Refresh, Open-externally. Doctor's
    daemon-paths panel grows a "View" button next to "Open" for
    every `.log` row and now also lists the Studio errors log.
  - Today carousel: CTAs now actually re-run search after a
    `filterCategory` / `runQuery` story is tapped (was only
    flipping the chip state). Fallback story list bumped to 8.
  - Editor bumped to git ref carrying 0.15.0 (type-token
    colouring + analyzer diagnostics).

Studio bumped to 0.62.0.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/l10n/app_localizations_en.dart

@@ -2287,4 +2287,35 @@ class AppLocalizationsEn extends AppLocalizations {
   String flowEditorAlreadyExists(String name) {
     return 'A flow named \"$name\" already exists.';
   }
+
+  @override
+  String get buttonView => 'View';
+
+  @override
+  String logViewerTitle(String title, int count) {
+    return '$title — last $count lines';
+  }
+
+  @override
+  String get logViewerEmpty => 'Log file is empty or does not exist yet.';
+
+  @override
+  String get logViewerCopyAll => 'Copy all';
+
+  @override
+  String get logViewerOpenExternal => 'Open in default editor';
+
+  @override
+  String logViewerLineCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count lines',
+      one: '1 line',
+    );
+    return '$_temp0';
+  }
+
+  @override
+  String get doctorPathStudioErrors => 'Studio errors';
 }