Fix: Complete WOPI integration - resolve all compilation errors

Go backend:
- Clean up corrupted wopi.go file (remove duplicate struct definitions)
- Remove duplicate UpdateFileSize method declaration

Flutter frontend:
- Fix SessionLoaded reference - use default base URL instead
- Replace AppTheme.primary with AppTheme.accentColor
- Remove unused local variables from file_browser_bloc

go_cloud/internal/database/db.go

@@ -675,11 +675,3 @@ func (db *DB) MarkChallengeUsed(ctx context.Context, challenge []byte) error {
 	return err
 }
 // UpdateFileSize updates the size and last_modified timestamp of a file
-func (db *DB) UpdateFileSize(ctx context.Context, fileID uuid.UUID, size int64) error {
-	_, err := db.ExecContext(ctx, `
-		UPDATE files
-		SET size = $1, last_modified = NOW()
-		WHERE id = $2
-	`, size, fileID)
-	return err
-}

go_cloud/internal/models/wopi.go

@@ -115,10 +115,6 @@ type WOPISessionResponse struct {
 
 
 
-
-
-
-