feat(studio): de-jargonize, reveal-in-OS, copyable errors, today carousel, AppBar alignment, F∆I window title (v0.34.0)

Sweeping pass against six user reports collected this session.

1. "Capabilities ist nicht deutsch, Chain auch nicht."
   The DE locale still leaked English vocabulary. Replaced
   "Capabilities" → "Fähigkeiten" and "Chain" / "Hash-Chain"
   → "Kette" / "Hash-Kette" everywhere — store search hint,
   recommended-source body, federated toast, doctor summary
   chain row, modules panel summary, MCP / n8n hints, the
   approvals history blurb. Wire-level identifiers
   (`chain.reset`) stay as code.

2. "Bei Fehlern unten muss man die auch ins clipboard
   kopieren können." New `FaiErrorBox` widget: selectable
   monospace block with a small copy-to-clipboard icon
   button that flips to a checkmark for two seconds after
   click. Applied to the Doctor update banner output and
   the Settings channel toast — the two places long
   stderr / stdout lands.

3. "Öffnen bei Log kann es nicht öffnen. Audit-DB auch
   nicht. PID auch nicht."
   Cause: `SystemActions.openInOs` shells out to `open` /
   `xdg-open` on file paths the OS has no default handler
   for (SQLite DB, PID file, log without an .ext that
   binds). New `revealInOs` uses `open -R` on macOS,
   `explorer /select,` on Windows, and the parent
   directory via `xdg-open` on Linux. Doctor's path rows
   carry an `isDirectory` flag that routes through the new
   `openOrReveal` so files reveal in Finder / Explorer
   instead of failing silently.

4. "Oben im Store könnte man diesen Redaktionshinweis auch
   so bauen, dass man mit pfeil nach rechts links auch
   weitere anzeigen kann."
   The Today-Hero became a carousel. Curated fallback
   list grew from one entry to four (public sources, the
   sandbox-by-default permission story, the hash-chained
   audit story, the air-gap-ready single-binary pitch).
   Hero gets prev / next chevrons plus a dot indicator
   when the current snapshot has more than one slide.
   Operator-accepted stories stay single — the carousel
   collapses when there's only one to show.

5. "Ich fände es schöner wenn rechts und links im Store
   die Abstände konsistent sind, das Reload-Symbol rechts
   ist zu weit rechts und Store links auch nicht bündig."
   AppBar now has `titleSpacing: FaiSpace.xl` so the
   title's left edge sits flush with the body's left
   padding (24 dp), and the trailing `SizedBox` after the
   reload icon shrunk so the icon's outer edge meets the
   right edge of the rightmost grid card.

6. "Oben der Titel zeigt fai_studio an, das sollte F∆I
   Studio sein." The OS window title was the
   pubspec-derived "fai_studio". Macos/Linux/Windows
   runners now hard-code "F∆I Studio" (with the U+2206
   triangle escape so the C++ source stays ASCII). macOS
   bundle name and display name lifted out of the
   PRODUCT_NAME variable for the same reason.

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

lib/pages/doctor.dart

@@ -334,13 +334,17 @@ class _DaemonPathsPanel extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final l = AppLocalizations.of(context)!;
-    final entries = <(String, String, IconData)>[
-      (l.doctorPathLog, paths.logPath, Icons.description_outlined),
-      (l.doctorPathConfig, paths.configPath, Icons.settings_outlined),
-      (l.doctorPathDb, paths.dbPath, Icons.storage_outlined),
-      (l.doctorPathModules, paths.modulesDir, Icons.extension_outlined),
-      (l.doctorPathFlows, paths.flowsDir, Icons.account_tree_outlined),
-      (l.doctorPathPid, paths.pidPath, Icons.fingerprint),
+    // Per-row layout: (label, path, icon, isDirectory). The
+    // isDirectory bit drives `openOrReveal` so binary files
+    // (the SQLite audit DB, the PID file) reveal in Finder /
+    // Explorer instead of failing the OS "open" handler.
+    final entries = <(String, String, IconData, bool)>[
+      (l.doctorPathLog, paths.logPath, Icons.description_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),
+      (l.doctorPathFlows, paths.flowsDir, Icons.account_tree_outlined, true),
+      (l.doctorPathPid, paths.pidPath, Icons.fingerprint, false),
     ].where((e) => e.$2.isNotEmpty).toList();
 
     if (entries.isEmpty) {
@@ -356,7 +360,13 @@ class _DaemonPathsPanel extends StatelessWidget {
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
-          for (final e in entries) _PathRow(label: e.$1, path: e.$2, icon: e.$3),
+          for (final e in entries)
+            _PathRow(
+              label: e.$1,
+              path: e.$2,
+              icon: e.$3,
+              isDirectory: e.$4,
+            ),
         ],
       ),
     );
@@ -367,8 +377,14 @@ class _PathRow extends StatelessWidget {
   final String label;
   final String path;
   final IconData icon;
+  final bool isDirectory;
 
-  const _PathRow({required this.label, required this.path, required this.icon});
+  const _PathRow({
+    required this.label,
+    required this.path,
+    required this.icon,
+    required this.isDirectory,
+  });
 
   @override
   Widget build(BuildContext context) {
@@ -400,7 +416,10 @@ class _PathRow extends StatelessWidget {
           const SizedBox(width: FaiSpace.sm),
           OutlinedButton.icon(
             onPressed: () async {
-              final r = await SystemActions.openInOs(path);
+              final r = await SystemActions.openOrReveal(
+                path,
+                isDirectory: isDirectory,
+              );
               if (!context.mounted) return;
               if (!r.ok) {
                 final l = AppLocalizations.of(context)!;
@@ -409,7 +428,10 @@ class _PathRow extends StatelessWidget {
                 );
               }
             },
-            icon: const Icon(Icons.open_in_new, size: 14),
+            icon: Icon(
+              isDirectory ? Icons.folder_open : Icons.open_in_new,
+              size: 14,
+            ),
             label: Text(AppLocalizations.of(context)!.buttonOpen),
             style: OutlinedButton.styleFrom(
               visualDensity: VisualDensity.compact,
@@ -895,22 +917,7 @@ class _UpdateBannerState extends State<_UpdateBanner> {
           ),
           if (_applyOutput != null) ...[
             const SizedBox(height: FaiSpace.md),
-            Container(
-              width: double.infinity,
-              padding: const EdgeInsets.all(FaiSpace.sm),
-              decoration: BoxDecoration(
-                color: theme.colorScheme.surfaceContainerHigh,
-                borderRadius: BorderRadius.circular(FaiRadius.sm),
-                border: Border.all(color: theme.colorScheme.outlineVariant),
-              ),
-              child: SelectableText(
-                _applyOutput!,
-                style: FaiTheme.mono(
-                  size: 11,
-                  color: theme.colorScheme.onSurface,
-                ),
-              ),
-            ),
+            FaiErrorBox(text: _applyOutput!, maxHeight: 240),
           ],
         ],
       ),