feat(briefing): hard-cut tear-down

Backend:
- Delete briefing services (pipeline, scheduler, conversations, profile, tools)
- Delete routes/briefing.py + remove blueprint registration
- Move _get_temp_unit into services/weather.get_temp_unit (reads top-level temp_unit setting)
- Rename briefing_preferences.py → rss_filtering.py (functions are RSS-specific)
- Strip briefing scheduler hooks from app.py
- Strip briefing scheduler call from routes/settings.py
- Update test imports (test_rss_service, test_tz_helpers)

Frontend:
- Delete BriefingView, BriefingSetupWizard, BriefingToolStatusRow
- Strip /briefing route + nav links (AppHeader, KnowledgeView)
- Strip Settings → Briefing tab + state + functions + imports
- Strip briefing-intermediate handling from ChatMessage
- Hide /news route + nav links (NewsView depended on briefing endpoints; orphaned in tree)
- Drop unused useSettingsStore from AppHeader

The Android BriefingScreen lives in a separate repo and is not touched here.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/fabledassistant/services/tools/weather.py

@@ -26,18 +26,18 @@ logger = logging.getLogger(__name__)
     briefing=True,
 )
 async def get_weather_tool(*, user_id, arguments, **_ctx):
-    from fabledassistant.services.briefing_pipeline import _get_temp_unit
     from fabledassistant.services.weather import (
         _fetch_open_meteo,
         geocode,
         get_cached_weather,
+        get_temp_unit,
         parse_forecast,
         refresh_location_cache,
     )
 
     location = (arguments.get("location") or "").strip()
     num_days = max(1, min(8, int(arguments.get("days") or 1)))
-    temp_unit = await _get_temp_unit(user_id)
+    temp_unit = await get_temp_unit(user_id)
 
     def _apply_unit(days: list[dict]) -> list[dict]:
         if temp_unit != "F":
@@ -82,7 +82,7 @@ async def get_weather_tool(*, user_id, arguments, **_ctx):
     if stale_keys:
         try:
             from fabledassistant.services.settings import get_setting as _wx_get_setting
-            raw_cfg = await _wx_get_setting(user_id, "briefing_config", "{}")
+            raw_cfg = await _wx_get_setting(user_id, "journal_config", "{}")
             cfg = _wx_json.loads(raw_cfg) if isinstance(raw_cfg, str) else (raw_cfg or {})
             cfg_locs = cfg.get("locations", {}) if isinstance(cfg, dict) else {}
             for key in stale_keys: