fix(bookings): preserve accommodation dates when place is unlinked or missing

- Remove NOT NULL constraint on day_accommodations.place_id (migration)
  and change ON DELETE CASCADE → SET NULL so deleting a place no longer
  cascades to the accommodation row
- Switch listAccommodations / getAccommodationWithPlace to LEFT JOIN so
  accommodations without a linked place are visible to the modal
- Relax create/update guards in reservationService to only require
  start_day_id + end_day_id, not place_id; place_id remains optional
- Client save guard now sends create_accommodation whenever FROM/TO days
  are set, regardless of whether a hotel place was selected
- Add re-hydration useEffect in ReservationModal to back-fill hotel
  fields from the accommodations prop when it arrives after modal opens
  (race between isOpen and the tripAccommodations fetch)
- Fix demo-seed TDZ crash: move db Proxy declaration before DEMO_MODE
  block so circular require in demo-reset resolves correctly
- Sidebar accommodation badge falls back to reservation title when
  place_name is null; click/cursor disabled for placeless accommodations
- listAccommodations now joins reservations to expose reservation_title

server/src/db/database.ts

@@ -35,15 +35,6 @@ function initDb(): void {
 
 initDb();
 
-if (process.env.DEMO_MODE === 'true') {
-  try {
-    const { seedDemoData } = require('../demo/demo-seed');
-    seedDemoData(_db);
-  } catch (err: unknown) {
-    console.error('[Demo] Seed error:', err instanceof Error ? err.message : err);
-  }
-}
-
 const db = new Proxy({} as Database.Database, {
   get(_, prop: string | symbol) {
     if (!_db) throw new Error('Database connection is not available (restore in progress?)');
@@ -56,6 +47,15 @@ const db = new Proxy({} as Database.Database, {
   },
 });
 
+if (process.env.DEMO_MODE === 'true') {
+  try {
+    const { seedDemoData } = require('../demo/demo-seed');
+    seedDemoData(_db);
+  } catch (err: unknown) {
+    console.error('[Demo] Seed error:', err instanceof Error ? err.message : err);
+  }
+}
+
 function closeDb(): void {
   if (_db) {
     try { _db.exec('PRAGMA wal_checkpoint(TRUNCATE)'); } catch (e) {}

server/src/db/migrations.ts

@@ -1876,6 +1876,36 @@ function runMigrations(db: Database.Database): void {
       if (!hasCol) return;
       db.prepare('DELETE FROM oauth_tokens WHERE audience IS NULL').run();
     },
+    // Remove NOT NULL constraint on day_accommodations.place_id so hotel
+    // reservations created from the Bookings tab without a linked place can
+    // still persist their date range. Change ON DELETE CASCADE → SET NULL so
+    // deleting a place orphans the accommodation row instead of cascading.
+    () => {
+      db.exec(`
+        CREATE TABLE day_accommodations_new (
+          id           INTEGER PRIMARY KEY AUTOINCREMENT,
+          trip_id      INTEGER NOT NULL REFERENCES trips(id) ON DELETE CASCADE,
+          place_id     INTEGER REFERENCES places(id) ON DELETE SET NULL,
+          start_day_id INTEGER NOT NULL REFERENCES days(id) ON DELETE CASCADE,
+          end_day_id   INTEGER NOT NULL REFERENCES days(id) ON DELETE CASCADE,
+          check_in     TEXT,
+          check_in_end TEXT,
+          check_out    TEXT,
+          confirmation TEXT,
+          notes        TEXT,
+          created_at   DATETIME DEFAULT CURRENT_TIMESTAMP
+        );
+        INSERT INTO day_accommodations_new
+          SELECT id, trip_id, place_id, start_day_id, end_day_id,
+                 check_in, check_in_end, check_out, confirmation, notes, created_at
+          FROM day_accommodations;
+        DROP TABLE day_accommodations;
+        ALTER TABLE day_accommodations_new RENAME TO day_accommodations;
+        CREATE INDEX IF NOT EXISTS idx_day_accommodations_trip_id ON day_accommodations(trip_id);
+        CREATE INDEX IF NOT EXISTS idx_day_accommodations_start_day_id ON day_accommodations(start_day_id);
+        CREATE INDEX IF NOT EXISTS idx_day_accommodations_end_day_id ON day_accommodations(end_day_id);
+      `);
+    },
   ];
 
   if (currentVersion < migrations.length) {

server/src/db/schema.ts

@@ -344,7 +344,7 @@ function createTables(db: Database.Database): void {
     CREATE TABLE IF NOT EXISTS day_accommodations (
       id INTEGER PRIMARY KEY AUTOINCREMENT,
       trip_id INTEGER NOT NULL REFERENCES trips(id) ON DELETE CASCADE,
-      place_id INTEGER NOT NULL REFERENCES places(id) ON DELETE CASCADE,
+      place_id INTEGER REFERENCES places(id) ON DELETE SET NULL,
       start_day_id INTEGER NOT NULL REFERENCES days(id) ON DELETE CASCADE,
       end_day_id INTEGER NOT NULL REFERENCES days(id) ON DELETE CASCADE,
       check_in TEXT,