fix: replace hardcoded UI strings with i18n translation keys

Address review findings by converting hardcoded user-facing strings
to react-i18next translation keys in roadmap feature components.

Changes:
- Add 'goToTask', 'convertToTask', 'build' keys to roadmap section
  in both en/common.json and fr/common.json
- Replace hardcoded "Go to Task" with t('roadmap.goToTask')
- Replace hardcoded "Convert to Auto-Build Task" with t('roadmap.convertToTask')
- Replace hardcoded "Build" with t('roadmap.build')

Files modified:
- FeatureDetailPanel.tsx: 2 hardcoded strings replaced
- FeatureCard.tsx: 2 hardcoded strings replaced
- en/common.json: 3 new translation keys added
- fr/common.json: 3 new French translations added

Resolves i18n violations identified in PR #1817 review.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/frontend/src/renderer/components/roadmap/FeatureCard.tsx

@@ -73,7 +73,7 @@ export function FeatureCard({
               }}
             >
               <ExternalLink className="h-3 w-3 mr-1" />
-              Go to Task
+              {t('roadmap.goToTask')}
             </Button>
           ) : (
             feature.status !== 'done' && (
@@ -86,7 +86,7 @@ export function FeatureCard({
                 }}
               >
                 <Play className="h-3 w-3 mr-1" />
-                Build
+                {t('roadmap.build')}
               </Button>
             )
           )}

apps/frontend/src/renderer/components/roadmap/FeatureDetailPanel.tsx

@@ -247,7 +247,7 @@ export function FeatureDetailPanel({
           <div className="shrink-0 p-4 border-t border-border space-y-2">
             <Button className="w-full" onClick={() => onGoToTask(feature.linkedSpecId!)}>
               <ExternalLink className="h-4 w-4 mr-2" />
-              Go to Task
+              {t('roadmap.goToTask')}
             </Button>
             {archiveButton}
           </div>
@@ -263,7 +263,7 @@ export function FeatureDetailPanel({
           <div className="shrink-0 p-4 border-t border-border">
             <Button className="w-full" onClick={() => onConvertToSpec(feature)}>
               <Zap className="h-4 w-4 mr-2" />
-              Convert to Auto-Build Task
+              {t('roadmap.convertToTask')}
             </Button>
           </div>
         );

apps/frontend/src/shared/i18n/locales/en/common.json

@@ -606,7 +606,10 @@
     "showLessFeatures": "Show less",
     "archiveFeature": "Archive",
     "archiveFeatureConfirmTitle": "Archive Feature?",
-    "archiveFeatureConfirmDescription": "This will remove \"{{title}}\" from your roadmap."
+    "archiveFeatureConfirmDescription": "This will remove \"{{title}}\" from your roadmap.",
+    "goToTask": "Go to Task",
+    "convertToTask": "Convert to Auto-Build Task",
+    "build": "Build"
   },
   "roadmapGeneration": {
     "progress": "Progress",

apps/frontend/src/shared/i18n/locales/fr/common.json

@@ -606,7 +606,10 @@
     "showLessFeatures": "Afficher moins",
     "archiveFeature": "Archiver",
     "archiveFeatureConfirmTitle": "Archiver la fonctionnalité ?",
-    "archiveFeatureConfirmDescription": "Cela supprimera \"{{title}}\" de votre feuille de route."
+    "archiveFeatureConfirmDescription": "Cela supprimera \"{{title}}\" de votre feuille de route.",
+    "goToTask": "Aller à la tâche",
+    "convertToTask": "Convertir en tâche Auto-Build",
+    "build": "Construire"
   },
   "roadmapGeneration": {
     "progress": "Progression",