Fix: Strip file extensions from target database names to prevent double extensions

- Created stripFileExtensions() helper that loops until all extensions removed
- Applied to both --target flag values and extracted archive names
- Handles cases like .sql.gz.sql.gz by repeatedly stripping until clean
- Updated both cmd/restore.go and internal/tui/archive_browser.go
- Ensures database names never contain .sql, .dump, .tar.gz etc extensions

cmd/restore.go

@@ -200,6 +200,10 @@ func runRestoreSingle(cmd *cobra.Command, args []string) error {
 		if targetDB == "" {
 			return fmt.Errorf("cannot determine database name, please specify --target")
 		}
+	} else {
+		// If target was explicitly provided, also strip common file extensions
+		// in case user included them in the target name
+		targetDB = stripFileExtensions(targetDB)
 	}
 
 	// Safety checks
@@ -445,16 +449,30 @@ type archiveInfo struct {
 	DBName   string
 }
 
+// stripFileExtensions removes common backup file extensions from a name
+func stripFileExtensions(name string) string {
+	// Remove extensions (handle double extensions like .sql.gz.sql.gz)
+	for {
+		oldName := name
+		name = strings.TrimSuffix(name, ".tar.gz")
+		name = strings.TrimSuffix(name, ".dump.gz")
+		name = strings.TrimSuffix(name, ".sql.gz")
+		name = strings.TrimSuffix(name, ".dump")
+		name = strings.TrimSuffix(name, ".sql")
+		// If no change, we're done
+		if name == oldName {
+			break
+		}
+	}
+	return name
+}
+
 // extractDBNameFromArchive extracts database name from archive filename
 func extractDBNameFromArchive(filename string) string {
 	base := filepath.Base(filename)
 
 	// Remove extensions
-	base = strings.TrimSuffix(base, ".tar.gz")
-	base = strings.TrimSuffix(base, ".dump.gz")
-	base = strings.TrimSuffix(base, ".sql.gz")
-	base = strings.TrimSuffix(base, ".dump")
-	base = strings.TrimSuffix(base, ".sql")
+	base = stripFileExtensions(base)
 
 	// Remove timestamp patterns (YYYYMMDD_HHMMSS)
 	parts := strings.Split(base, "_")