feat(ux): Sprint 3 mobile nav, sync conflicts, and resilience

Improve mobile bottom navigation, accessible dialogs and cards, explicit
sync conflict resolution, i18n error messages, encrypted draft autosave,
and persistent storage hints for offline data safety.

Co-authored-by: Cursor <cursoragent@cursor.com>

client/src/services/db.ts

@@ -90,6 +90,15 @@ export interface SyncQueueItem {
   updatedAt: string
 }
 
+export interface EntryDraftRecord {
+  logbookId: string
+  entryId: string
+  encryptedData: string
+  iv: string
+  tag: string
+  updatedAt: string
+}
+
 class DaagboxDatabase extends Dexie {
   logbooks!: Table<LocalLogbook>
   yachts!: Table<LocalYacht>
@@ -101,6 +110,7 @@ class DaagboxDatabase extends Dexie {
   nmeaArchives!: Table<LocalNmeaArchive>
   logbookKeys!: Table<LocalLogbookKey>
   syncQueue!: Table<SyncQueueItem>
+  entryDrafts!: Table<EntryDraftRecord, [string, string]>
 
   constructor() {
     super('DaagboxDatabase')
@@ -167,6 +177,19 @@ class DaagboxDatabase extends Dexie {
       nmeaArchives: 'entryId, logbookId, updatedAt',
       logbookKeys: 'logbookId'
     })
+    this.version(7).stores({
+      logbooks: 'id, encryptedTitle, updatedAt, isSynced, isShared, isDemo',
+      yachts: 'logbookId, updatedAt',
+      crews: 'payloadId, logbookId, updatedAt',
+      deviations: 'logbookId, updatedAt',
+      entries: 'payloadId, logbookId, updatedAt',
+      syncQueue: '++id, action, type, payloadId, logbookId',
+      photos: 'payloadId, entryId, logbookId, updatedAt',
+      gpsTracks: 'entryId, logbookId, updatedAt',
+      nmeaArchives: 'entryId, logbookId, updatedAt',
+      logbookKeys: 'logbookId',
+      entryDrafts: '[logbookId+entryId], updatedAt'
+    })
   }
 }