fix(i18n): stop warning on missing tool.name.* keys for proper-name tools (T-493)

Tool display names are open-ended (Bash, Grep, Glob, ScheduleWakeup, MCP tools,
…) — they intentionally have no catalog key and fall back to the raw name, so a
miss isn't a gap to fix. The conversation pane was logging an i18n "missing key"
warning for each, cluttering the output dock.

Adds a `warnIfMissing` flag to I18nService.string (default true, so fixed UI
strings still warn on a real gap) threaded through the ClideSettings facade;
_toolNameLabel passes false. Display is unchanged — the placeholder already
rendered the raw name.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/builtin/claude/src/conversation_view.dart

@@ -1162,10 +1162,11 @@ class _ActivityCard extends StatelessWidget {
 }
 
 /// Localized display label for a tool name (T-462). File/web/task operations
-/// have natural translations; command/proper-name tools (Bash, Grep, Glob, LS)
-/// have no catalog key and fall back to the raw name via the placeholder.
+/// have natural translations; command/proper-name tools (Bash, Grep, Glob,
+/// ScheduleWakeup, MCP tools, …) have no catalog key by design and fall back to
+/// the raw name — so `warnIfMissing: false` keeps a miss from logging (T-493).
 String _toolNameLabel(BuildContext context, String name) =>
-    ClideSettings.i18n.string(context, 'tool.name.$name', namespace: 'builtin.claude', placeholder: name);
+    ClideSettings.i18n.string(context, 'tool.name.$name', namespace: 'builtin.claude', placeholder: name, warnIfMissing: false);
 
 /// Localized "N steps" counter for a collapser header (T-462). Singular and
 /// plural are distinct catalog keys; the English forms double as the fallback.

lib/kernel/src/i18n/i18n.dart

@@ -92,10 +92,15 @@ class I18n extends ChangeNotifier {
   /// Look up a key, walking the locale fallback chain. Returns the
   /// placeholder if nothing hits; returns the key itself when placeholder
   /// is null (developer fallback — keys are more useful than blanks).
-  String string(String key, {required String namespace, String? placeholder}) {
+  /// [warnIfMissing] false suppresses the missing-key warning for OPEN-ENDED
+  /// lookups where a miss is the normal case, not a bug — e.g. tool display
+  /// names (`tool.name.Bash`, `tool.name.ScheduleWakeup`, MCP tools), which are
+  /// proper-name identifiers that intentionally fall back to the raw name. Keep
+  /// the warning on for fixed UI strings, where a miss is a real translation gap.
+  String string(String key, {required String namespace, String? placeholder, bool warnIfMissing = true}) {
     final byLocale = _cache[namespace];
     if (byLocale == null) {
-      _warnOnce('$namespace::MISSING_NAMESPACE::$key', 'i18n: namespace not registered: $namespace (key: $key)');
+      if (warnIfMissing) _warnOnce('$namespace::MISSING_NAMESPACE::$key', 'i18n: namespace not registered: $namespace (key: $key)');
       return placeholder ?? key;
     }
 
@@ -108,7 +113,9 @@ class I18n extends ChangeNotifier {
       if (hit != null) return hit;
     }
 
-    _warnOnce('$namespace::${_current.languageCode}::$key', 'i18n: missing key "$key" in namespace "$namespace" (locale ${_current.toString()})');
+    if (warnIfMissing) {
+      _warnOnce('$namespace::${_current.languageCode}::$key', 'i18n: missing key "$key" in namespace "$namespace" (locale ${_current.toString()})');
+    }
     return placeholder ?? key;
   }
 

lib/widgets/src/clide_settings.dart

@@ -54,9 +54,9 @@ class _I18n {
   /// uniform widget-facing lookup (T-462). [placeholder] is the inline English
   /// fallback. With no kernel in scope (isolated primitive tests) it returns
   /// the placeholder, so a widget never needs one to render.
-  String string(BuildContext context, String key, {required String namespace, String? placeholder}) {
+  String string(BuildContext context, String key, {required String namespace, String? placeholder, bool warnIfMissing = true}) {
     final i = ClideKernel.maybeOf(context)?.i18n;
-    return i == null ? (placeholder ?? key) : i.string(key, namespace: namespace, placeholder: placeholder);
+    return i == null ? (placeholder ?? key) : i.string(key, namespace: namespace, placeholder: placeholder, warnIfMissing: warnIfMissing);
   }
 
   /// [string] with `replaceAll` interpolation per replacer (templated labels).