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/widgets/fai_error_box.dart

@@ -0,0 +1,113 @@
+// FaiErrorBox — selectable monospace error / output block with
+// a small copy-to-clipboard button in the top-right corner.
+//
+// Used wherever the operator might want to paste daemon stderr
+// into a chat or bug report: the update banner, install
+// progress dialog, system-AI editor, audit-clear failures, etc.
+// SelectableText alone works for keyboard users but the copy
+// affordance has to be explicit so trackpad operators see it.
+
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+
+import '../l10n/app_localizations.dart';
+import '../theme/theme.dart';
+import '../theme/tokens.dart';
+
+class FaiErrorBox extends StatefulWidget {
+  /// The text the operator wants to read (and copy). Rendered
+  /// monospace, selectable, multi-line.
+  final String text;
+  /// When true, the box border + foreground colour come from the
+  /// error palette. False renders neutral chrome — useful for
+  /// success / informational copy that still wants the copy
+  /// button.
+  final bool isError;
+  /// Optional max-height before the content scrolls inside the
+  /// box. Falls back to no constraint when null so short
+  /// messages don't get a useless scrollbar.
+  final double? maxHeight;
+
+  const FaiErrorBox({
+    super.key,
+    required this.text,
+    this.isError = false,
+    this.maxHeight,
+  });
+
+  @override
+  State<FaiErrorBox> createState() => _FaiErrorBoxState();
+}
+
+class _FaiErrorBoxState extends State<FaiErrorBox> {
+  bool _justCopied = false;
+
+  Future<void> _copy() async {
+    await Clipboard.setData(ClipboardData(text: widget.text));
+    if (!mounted) return;
+    setState(() => _justCopied = true);
+    Future.delayed(const Duration(seconds: 2), () {
+      if (mounted) setState(() => _justCopied = false);
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    final l = AppLocalizations.of(context)!;
+    final accent = widget.isError
+        ? theme.colorScheme.error
+        : theme.colorScheme.outlineVariant;
+    final fg = widget.isError
+        ? theme.colorScheme.error
+        : theme.colorScheme.onSurface;
+    return Container(
+      width: double.infinity,
+      padding: const EdgeInsets.fromLTRB(
+        FaiSpace.sm,
+        FaiSpace.xs,
+        FaiSpace.xs,
+        FaiSpace.sm,
+      ),
+      decoration: BoxDecoration(
+        color: theme.colorScheme.surfaceContainerHigh,
+        borderRadius: BorderRadius.circular(FaiRadius.sm),
+        border: Border.all(color: accent.withValues(alpha: 0.4)),
+      ),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.end,
+        children: [
+          // Copy button sits above the text on its own row so
+          // long messages never collide with it. Compact enough
+          // not to dominate short single-line messages.
+          Tooltip(
+            message: _justCopied ? l.buttonCopied : l.buttonCopy,
+            child: IconButton(
+              icon: Icon(
+                _justCopied ? Icons.check : Icons.content_copy,
+                size: 14,
+              ),
+              visualDensity: VisualDensity.compact,
+              padding: const EdgeInsets.all(4),
+              constraints: const BoxConstraints(),
+              onPressed: _copy,
+            ),
+          ),
+          ConstrainedBox(
+            constraints: BoxConstraints(
+              maxHeight: widget.maxHeight ?? double.infinity,
+            ),
+            child: Scrollbar(
+              child: SingleChildScrollView(
+                child: SelectableText(
+                  widget.text,
+                  style: FaiTheme.mono(size: 11, color: fg),
+                ),
+              ),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}

lib/widgets/fai_settings_dialog.dart

@@ -10,6 +10,7 @@ import '../data/system_actions.dart';
 import '../l10n/app_localizations.dart';
 import '../theme/theme.dart';
 import '../theme/tokens.dart';
+import 'fai_error_box.dart';
 import 'fai_pill.dart';
 import 'fai_system_ai_editor.dart';
 
@@ -416,22 +417,7 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
                 ),
               if (_channelToast != null) ...[
                 const SizedBox(height: FaiSpace.sm),
-                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(
-                    _channelToast!,
-                    style: FaiTheme.mono(
-                      size: 11,
-                      color: theme.colorScheme.onSurface,
-                    ),
-                  ),
-                ),
+                FaiErrorBox(text: _channelToast!, maxHeight: 200),
               ],
             ],
             if (_aiStatus != null) ...[

lib/widgets/widgets.dart

@@ -8,6 +8,7 @@ export 'fai_card.dart';
 export 'fai_data_row.dart';
 export 'fai_delta_mark.dart';
 export 'fai_empty_state.dart';
+export 'fai_error_box.dart';
 export 'fai_module_sheet.dart';
 export 'fai_pill.dart';
 export 'fai_settings_dialog.dart';