Fix manual switch reverting instantly, add weather forecast

- scheduler: "Show X now" was a true one-shot -- reverted on the very next
  5s tick, causing the flash-to-X-then-flash-back-to-clock behavior. Now
  pins for 5 minutes (still preemptable by Navidrome priority, which stays
  authoritative). Added a "Resume automatic" action/button and status
  display showing what's pinned and until when.
- weather: daily forecast strip (3/5/7 days, selectable in settings) below
  current conditions, via Open-Meteo's daily= params in the same request.
  Fixed a bad symbol choice along the way -- DejaVu Sans has no glyph for
  the partly-cloudy emoji, was rendering as a tofu box; swapped to the
  plain cloud symbol, verified glyph coverage for the whole WMO code table.

web/templates/base.html

@@ -108,7 +108,7 @@
     label { display: block; font-weight: 600; margin-bottom: 0.35rem; font-size: 0.85rem; }
     .hint { font-size: 0.78rem; color: var(--text-muted); margin: 0.35rem 0 0; }
 
-    input[type=text], input[type=password], input[type=number] {
+    input[type=text], input[type=password], input[type=number], select, input[type=file] {
       width: 100%;
       padding: 0.6rem 0.7rem;
       font-size: 0.95rem;

web/templates/index.html

@@ -22,6 +22,10 @@
       <span class="badge {{ 'on' if rotation.enabled else 'off' }}">{{ "on" if rotation.enabled else "off" }}</span>
       {{ rotation.screens | join(" → ") }} (every {{ rotation.interval_minutes }} min)
     </dd>
+    {% if status.manual_screen %}
+    <dt>Manual pin</dt>
+    <dd><span class="badge on">{{ screens[status.manual_screen].display_name }}</span> until {{ status.manual_until }}</dd>
+    {% endif %}
   </dl>
 </div>
 
@@ -36,6 +40,11 @@
       <button class="secondary" type="submit">Show {{ screen.display_name }}</button>
     </form>
     {% endfor %}
+    {% if status.manual_screen %}
+    <form class="inline" method="post" action="{{ url_for('resume_rotation') }}">
+      <button class="secondary" type="submit">Resume automatic</button>
+    </form>
+    {% endif %}
   </div>
 </div>
 {% endblock %}

web/templates/settings_picture.html

@@ -43,7 +43,7 @@
     <div class="section-label">Display options</div>
     <div class="field">
       <label for="fit">Fit</label>
-      <select id="fit" name="fit" style="width:100%; padding:0.6rem 0.7rem; font-size:0.95rem; font-family:inherit; background:var(--bg); color:var(--text); border:1px solid var(--border); border-radius:8px;">
+      <select id="fit" name="fit">
         <option value="cover" {{ "selected" if settings.fit == "cover" }}>Cover -- fill the screen, cropping edges</option>
         <option value="contain" {{ "selected" if settings.fit == "contain" }}>Contain -- show the whole image, letterboxed</option>
       </select>

web/templates/settings_weather.html

@@ -19,6 +19,18 @@
     </div>
   </div>
 
+  <div class="card">
+    <div class="section-label">Forecast</div>
+    <div class="field">
+      <label for="forecast_days">Days to show</label>
+      <select id="forecast_days" name="forecast_days">
+        <option value="3" {{ "selected" if settings.forecast_days == 3 or not settings.forecast_days }}>3 days</option>
+        <option value="5" {{ "selected" if settings.forecast_days == 5 }}>5 days</option>
+        <option value="7" {{ "selected" if settings.forecast_days == 7 }}>7 days</option>
+      </select>
+    </div>
+  </div>
+
   <div class="card">
     <div class="section-label">Or enter coordinates manually</div>
     <p class="hint" style="margin: -0.25rem 0 1rem;">Leave the city field above empty to use these instead.</p>