Add activity import source badge, delete action, and No GPS indicator

- Activity detail: show "Imported from wahoo" badge when activity was
  imported from an external provider
- Activity detail: add delete button with confirmation, cleans up
  sync_imports so the workout can be reimported
- Import page: show "No GPS" badge with tooltip on workouts that have
  no file URL from the provider

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/i18n/src/locales/de.ts

@@ -134,6 +134,9 @@ export default {
       duration: "Dauer",
       linkToRoute: "Mit Route verknüpfen",
       createRouteFromActivity: "Route aus Aktivität erstellen",
+      delete: "Aktivität löschen",
+      deleteConfirm: "Möchtest du diese Aktivität wirklich löschen?",
+      importedFrom: "Importiert von {{provider}}",
     },
     settings: {
       title: "Einstellungen",
@@ -181,6 +184,8 @@ export default {
       importFrom: "Import von {{provider}}",
       imported: "Importiert",
       noWorkouts: "Keine Workouts gefunden.",
+      noGps: "Kein GPS",
+      noGpsTooltip: "{{provider}} stellt für diese Aktivität keine Routendaten bereit",
       previous: "Zurück",
       next: "Weiter",
     },

packages/i18n/src/locales/en.ts

@@ -134,6 +134,9 @@ export default {
       duration: "Duration",
       linkToRoute: "Link to Route",
       createRouteFromActivity: "Create Route from Activity",
+      delete: "Delete Activity",
+      deleteConfirm: "Are you sure you want to delete this activity?",
+      importedFrom: "Imported from {{provider}}",
     },
     settings: {
       title: "Settings",
@@ -181,6 +184,8 @@ export default {
       importFrom: "Import from {{provider}}",
       imported: "Imported",
       noWorkouts: "No workouts found.",
+      noGps: "No GPS",
+      noGpsTooltip: "{{provider}} does not provide route data for this activity",
       previous: "Previous",
       next: "Next",
     },