add blocker presets

backend/app/services/settings_service.py

@@ -19,6 +19,7 @@ from sqlalchemy.orm import Session
 
 from app.config import env_settings
 from app.models import SettingsRow
+from app.services import pomodoro
 from app.settings_schema import SECRET_FIELDS, SECRET_MASK, AppSettings
 
 _SETTINGS_ID = 1
@@ -193,4 +194,11 @@ def apply_patch(session: Session, patch: dict[str, Any]) -> AppSettings:
     current = load_settings(session).model_dump(mode="json")
     patch = unmask_secrets(current, patch)
     merged = _merge(current, patch)
-    return save_settings(session, AppSettings.model_validate(merged))
+    updated = save_settings(session, AppSettings.model_validate(merged))
+
+    # A changed Focus/Short/Long minute (directly, or via a preset) resizes
+    # whatever interval is already running or paused — see
+    # `pomodoro.rescale_current`. Cheap and a no-op when nothing moved, so it
+    # is simplest to always run it rather than detect which keys changed.
+    pomodoro.rescale_current(session, updated)
+    return updated