Fix database migration errors by improving error handling

- Enhanced migration service to handle duplicate column errors gracefully
- Added detection for 'duplicate column' and 'already exists' errors
- Migration service now marks partially applied migrations as complete
- Prevents Electron app crashes due to cross-platform database conflicts
- Improved robustness for database schema migrations

Fixes database initialization issues when switching between platforms
(web, mobile, electron) that may have different migration states.

src/db-sql/migration.ts

@@ -121,6 +121,11 @@ const MIGRATIONS = [
   {
     name: "002_add_iViewContent_to_contacts",
     sql: `
+      -- We need to handle the case where iViewContent column might already exist
+      -- SQLite doesn't support IF NOT EXISTS for ALTER TABLE ADD COLUMN
+      -- So we'll use a more robust approach with error handling in the migration service
+      
+      -- First, try to add the column - this will fail silently if it already exists
       ALTER TABLE contacts ADD COLUMN iViewContent BOOLEAN DEFAULT TRUE;
     `,
   },