feat: implement scroll position restoration for mobile tabs and add double-tap home navigation to refresh feed views.

internal/db/db.go

@@ -168,6 +168,9 @@ func (d *DB) migrate() error {
 		WHERE (icon_url IS NULL OR icon_url = '') AND site_url IS NOT NULL AND site_url != ''
 	`)
 
+	// Migration for preferences column on users table if older DB exists
+	_, _ = d.Exec("ALTER TABLE users ADD COLUMN preferences TEXT DEFAULT '{}'")
+
 	// Migration for rules table schema if older table exists
 	var testCol string
 	err := d.QueryRow("SELECT trigger FROM rules LIMIT 1").Scan(&testCol)
@@ -199,13 +202,20 @@ func (d *DB) CountUsers() (int, error) {
 
 func (d *DB) GetUserByUsername(username string) (*models.User, error) {
 	var u models.User
+	var prefsRaw sql.NullString
 	err := d.QueryRow(
-		"SELECT id, username, password_hash, created_at, updated_at FROM users WHERE username = ?",
+		"SELECT id, username, password_hash, preferences, created_at, updated_at FROM users WHERE username = ?",
 		username,
-	).Scan(&u.ID, &u.Username, &u.PasswordHash, &u.CreatedAt, &u.UpdatedAt)
+	).Scan(&u.ID, &u.Username, &u.PasswordHash, &prefsRaw, &u.CreatedAt, &u.UpdatedAt)
 	if err != nil {
 		return nil, err
 	}
+	if prefsRaw.Valid && prefsRaw.String != "" {
+		_ = json.Unmarshal([]byte(prefsRaw.String), &u.Preferences)
+	}
+	if u.Preferences == nil {
+		u.Preferences = make(map[string]interface{})
+	}
 	return &u, nil
 }
 
@@ -215,12 +225,13 @@ func (d *DB) CreateUser(username, passwordHash string) (*models.User, error) {
 		ID:           uuid.New().String(),
 		Username:     username,
 		PasswordHash: passwordHash,
+		Preferences:  make(map[string]interface{}),
 		CreatedAt:    now,
 		UpdatedAt:    now,
 	}
 	_, err := d.Exec(
-		"INSERT INTO users (id, username, password_hash, created_at, updated_at) VALUES (?, ?, ?, ?, ?)",
-		u.ID, u.Username, u.PasswordHash, u.CreatedAt, u.UpdatedAt,
+		"INSERT INTO users (id, username, password_hash, preferences, created_at, updated_at) VALUES (?, ?, ?, ?, ?, ?)",
+		u.ID, u.Username, u.PasswordHash, "{}", u.CreatedAt, u.UpdatedAt,
 	)
 	if err != nil {
 		return nil, err
@@ -237,6 +248,19 @@ func (d *DB) UpdateUserPassword(userID, passwordHash string) error {
 	return err
 }
 
+func (d *DB) UpdateUserPreferences(userID string, prefs map[string]interface{}) error {
+	raw, err := json.Marshal(prefs)
+	if err != nil {
+		return err
+	}
+	now := time.Now().UTC()
+	_, err = d.Exec(
+		"UPDATE users SET preferences = ?, updated_at = ? WHERE id = ?",
+		string(raw), now, userID,
+	)
+	return err
+}
+
 // Category operations
 func (d *DB) ListCategories() ([]models.Category, error) {
 	query := `