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/pages/doctor.dart

@@ -1,5 +1,7 @@
 import 'package:flutter/material.dart';
 
+import '../data/error_presentation.dart';
+import '../data/fai_log.dart';
 import '../data/hub.dart';
 import '../data/system_actions.dart';
 import '../l10n/app_localizations.dart';
@@ -343,6 +345,12 @@ class _DaemonPathsPanel extends StatelessWidget {
     // Explorer instead of failing the OS "open" handler.
     final entries = <(String, String, IconData, bool)>[
       (l.doctorPathLog, paths.logPath, Icons.description_outlined, false),
+      (
+        l.doctorPathStudioErrors,
+        FaiLog.instance.path,
+        Icons.report_problem_outlined,
+        false,
+      ),
       (l.doctorPathConfig, paths.configPath, Icons.settings_outlined, false),
       (l.doctorPathDb, paths.dbPath, Icons.storage_outlined, false),
       (l.doctorPathModules, paths.modulesDir, Icons.extension_outlined, true),
@@ -387,6 +395,8 @@ class _PathRow extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
+    final l = AppLocalizations.of(context)!;
+    final isLog = !isDirectory && path.toLowerCase().endsWith('.log');
     return Padding(
       padding: const EdgeInsets.symmetric(vertical: 4),
       child: Row(
@@ -412,6 +422,18 @@ class _PathRow extends StatelessWidget {
             ),
           ),
           const SizedBox(width: FaiSpace.sm),
+          if (isLog) ...[
+            OutlinedButton.icon(
+              onPressed: () =>
+                  showFaiLogViewer(context, path: path, title: label),
+              icon: const Icon(Icons.visibility_outlined, size: 14),
+              label: Text(l.buttonView),
+              style: OutlinedButton.styleFrom(
+                visualDensity: VisualDensity.compact,
+              ),
+            ),
+            const SizedBox(width: FaiSpace.xs),
+          ],
           OutlinedButton.icon(
             onPressed: () async {
               final r = await SystemActions.openOrReveal(
@@ -420,9 +442,10 @@ class _PathRow extends StatelessWidget {
               );
               if (!context.mounted) return;
               if (!r.ok) {
-                final l = AppLocalizations.of(context)!;
-                ScaffoldMessenger.of(context).showSnackBar(
-                  SnackBar(content: Text(l.doctorOpenError(r.stderr))),
+                showFaiErrorSnack(
+                  context,
+                  'doctor.open-path',
+                  r.stderr.isEmpty ? 'open failed' : r.stderr,
                 );
               }
             },
@@ -430,7 +453,7 @@ class _PathRow extends StatelessWidget {
               isDirectory ? Icons.folder_open : Icons.open_in_new,
               size: 14,
             ),
-            label: Text(AppLocalizations.of(context)!.buttonOpen),
+            label: Text(l.buttonOpen),
             style: OutlinedButton.styleFrom(
               visualDensity: VisualDensity.compact,
             ),