fix: prevent UI freeze after saving signed log entries

Cache plaintext list metadata on entry save so the journal list avoids
full decrypt per row, and batch sync pull writes with main-thread yields.

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

client/src/services/db.ts

@@ -35,6 +35,14 @@ export interface LocalDeviation {
   updatedAt: string
 }
 
+export interface EntryListCache {
+  date: string
+  dayOfTravel: string
+  departure: string
+  destination: string
+  skipperSignStatus: 'none' | 'valid' | 'invalid'
+}
+
 export interface LocalEntry {
   payloadId: string
   logbookId: string
@@ -42,6 +50,8 @@ export interface LocalEntry {
   iv: string
   tag: string
   updatedAt: string
+  /** Plaintext list fields — avoids full decrypt when opening the journal list. */
+  listCache?: EntryListCache
 }
 
 export interface LocalPhoto {