feat: image AI titles (3 suggestions), describe-images action, pin/list fixes, i18n

- Add image description service + API route for AI-powered image analysis
- Image title generation returns 3 selectable suggestions via TitleSuggestions component
- Add "Describe images" action in AI assistant (individual + collective)
- Fix pin refresh propagation in card and tabs view
- Fix note creation refresh in tabs mode, pass all notes to tabs view
- Add RTL support (dir="auto") on note content elements
- Pass UI language dynamically to AI endpoints instead of hardcoded 'fr'
- Add 18 missing i18n keys in both en.json and fr.json
- Sparkles button on images for AI title generation (bottom-right, pulse animation)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

memento-note/locales/en.json

@@ -39,7 +39,8 @@
     "newNoteTabsHint": "Create note in this notebook",
     "noLabelsInNotebook": "No labels in this notebook yet",
     "archive": "Archive",
-    "trash": "Trash"
+    "trash": "Trash",
+    "clearFilter": "Remove filter"
   },
   "notes": {
     "title": "Notes",
@@ -186,7 +187,21 @@
     "sortDateDesc": "Date (newest)",
     "sortDateAsc": "Date (oldest)",
     "sortTitleAsc": "Title A → Z",
-    "sortTitleDesc": "Title Z → A"
+    "sortTitleDesc": "Title Z → A",
+    "suggestTitle": "AI title",
+    "generateTitleFromImage": "Generate title from image",
+    "titleGenerated": "Title generated",
+    "content": "Content",
+    "restore": "Restore",
+    "createFailed": "Failed to create note",
+    "updateFailed": "Failed to update note",
+    "archived": "Note archived",
+    "archiveFailed": "Failed to archive",
+    "sort": "Sort",
+    "confirmDeleteTitle": "Delete note",
+    "leftShare": "Share removed",
+    "dismissed": "Note dismissed from recent",
+    "generalNotes": "General Notes"
   },
   "pagination": {
     "previous": "←",
@@ -390,11 +405,14 @@
     "transformationsDesc": "Transformations — applied directly to the note",
     "writeMinWordsAction": "Write at least 5 words to activate AI actions.",
     "processingAction": "Processing...",
+    "noImagesError": "No images in this note",
+    "overview": "Overview",
     "action": {
       "clarify": "Clarify",
       "shorten": "Shorten",
       "improve": "Improve",
-      "toMarkdown": "To Markdown"
+      "toMarkdown": "To Markdown",
+      "describeImages": "Describe images"
     },
     "openAssistant": "Open AI Assistant",
     "poweredByMomento": "Powered by Momento AI",
@@ -409,7 +427,9 @@
     "historyTab": "History",
     "insightsTab": "Insights",
     "aiCopilot": "AI Copilot",
-    "suggestTitle": "AI title suggestion"
+    "suggestTitle": "AI title suggestion",
+    "generateTitleFromImage": "Generate title from image",
+    "titleGenerated": "Title generated from image"
   },
   "titleSuggestions": {
     "available": "Title suggestions",
@@ -750,7 +770,8 @@
     "pdfGeneratedOn": "Generated on:",
     "confidence": "confidence",
     "savingReminder": "Failed to save reminder",
-    "removingReminder": "Failed to remove reminder"
+    "removingReminder": "Failed to remove reminder",
+    "generatingDescription": "Please wait..."
   },
   "notebookSuggestion": {
     "title": "Move to {name}?",
@@ -1143,7 +1164,8 @@
     "notesViewDescription": "Choose how notes are shown on home and in notebooks.",
     "notesViewLabel": "Notes layout",
     "notesViewTabs": "Tabs (OneNote-style)",
-    "notesViewMasonry": "Cards (grid)"
+    "notesViewMasonry": "Cards (grid)",
+    "selectTheme": "Select theme"
   },
   "generalSettings": {
     "title": "General Settings",
@@ -1567,7 +1589,8 @@
     "createFailed": "Creation failed",
     "deleteSpace": "Delete space",
     "deleted": "Space deleted",
-    "deleteError": "Error deleting"
+    "deleteError": "Error deleting",
+    "rename": "Rename"
   },
   "lab": {
     "initializing": "Initializing workspace",