feat: kanban status buttons, task back-nav, RSS UI, weather search, briefing fixes

Project view:
- Add inline status advance buttons on kanban task cards (todo→in_progress,
  in_progress→done); buttons reveal on hover, stop link navigation

Task viewer:
- Back button navigates to task's project instead of /tasks when project_id set
- Esc key navigates to project (or /tasks); blurs focused element first

Quick capture:
- Use user's configured model instead of hardcoded Config.OLLAMA_MODEL
- Remove create_project from classifier prompt (tool not offered, caused
  task-shaped inputs to silently fall through to note fallback)

Briefing scheduler:
- Fix get_event_loop() → get_running_loop() so background thread uses the
  correct hypercorn event loop (jobs were scheduling but never executing)
- Suppress bare greeting when both LLM synthesis lanes return empty

RSS feed UI (SettingsView):
- Show last-fetched age, category badge, and feed URL per row
- Category input field when adding a feed
- Refresh all button: fetches latest items, reloads list, toasts with count
- Enter key submits add-feed form; better empty-state hint with example feeds

Weather tool:
- Accept any city/region name in addition to 'home'/'work'/'all'
- Geocodes via Nominatim + fetches live from Open-Meteo for arbitrary queries

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/api/client.ts

@@ -384,11 +384,17 @@ export async function getBriefingFeeds(): Promise<BriefingFeed[]> {
   return data;
 }
 
-export async function createBriefingFeed(url: string): Promise<BriefingFeed> {
-  const data = await apiPost<{ id: number; url: string; title: string; category: string | null }>('/api/briefing/feeds', { url });
+export async function createBriefingFeed(url: string, category?: string): Promise<BriefingFeed> {
+  const body: Record<string, string> = { url };
+  if (category?.trim()) body.category = category.trim();
+  const data = await apiPost<{ id: number; url: string; title: string; category: string | null }>('/api/briefing/feeds', body);
   return { ...data, last_fetched_at: null };
 }
 
+export async function refreshBriefingFeeds(): Promise<{ feeds_refreshed: number; new_items: number }> {
+  return apiPost('/api/briefing/feeds/refresh', {});
+}
+
 export async function deleteBriefingFeed(id: number): Promise<void> {
   await apiDelete(`/api/briefing/feeds/${id}`);
 }