fix(briefing): 2-column layout with table-based weather forecast

Collapse briefing from 3-column to 2-column grid (chat + sidebar).
Weather moves to top of news column, forecast uses an HTML table so
rows align cleanly. Drop verbose condition text from forecast days
(emoji already conveys it). Switch CI node_modules cache to npm
download cache to avoid tar size error from onnxruntime-web.

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

.forgejo/workflows/ci.yml

@@ -68,19 +68,14 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
-      # Cache node_modules directly (not the npm download cache).
-      # npm ci still has to extract + link every module even with a
-      # warm download cache, which is where the real time goes. Caching
-      # the output directory lets us skip npm ci entirely on hits.
-      - name: Cache node_modules
-        id: npm-cache
+      - name: Cache npm download cache
         uses: actions/cache@v4
         with:
-          path: frontend/node_modules
-          key: node-modules-${{ hashFiles('frontend/package-lock.json') }}
+          path: ~/.npm
+          key: npm-cache-${{ hashFiles('frontend/package-lock.json') }}
+          restore-keys: npm-cache-
 
       - name: Install dependencies
-        if: steps.npm-cache.outputs.cache-hit != 'true'
         run: npm ci
         working-directory: frontend