feat: bucket list POIs with auto-search + optional dates — closes #105

- Bucket list now supports POIs (not just countries): add any place
  with auto-search via Google Places / Nominatim
- Optional target date (month/year) via CustomSelect dropdowns
- New target_date field on bucket_list table (DB migration)
- Server PUT route supports updating all fields
- Country bucket modal: date dropdowns default to empty
- CustomSelect: auto-opens upward when near bottom of viewport
- Search results open upward in the bucket add form
- i18n keys for DE and EN

server/src/db/migrations.ts

@@ -329,6 +329,10 @@ function runMigrations(db: Database.Database): void {
       // Add paid_by_user_id to budget_items for expense tracking / settlement
       try { db.exec('ALTER TABLE budget_items ADD COLUMN paid_by_user_id INTEGER REFERENCES users(id)'); } catch {}
     },
+    () => {
+      // Add target_date to bucket_list for optional visit planning
+      try { db.exec('ALTER TABLE bucket_list ADD COLUMN target_date TEXT DEFAULT NULL'); } catch {}
+    },
   ];
 
   if (currentVersion < migrations.length) {