Add location field to devices with dropdown selector

templates/device_add.html

@@ -39,6 +39,20 @@
              style="display:{% if _cur_type and _cur_type not in _preset_types %}''{% else %}none{% endif %};margin-top:0.4rem;">
     </div>
 
+    <div class="form-group">
+      <label>Location</label>
+      <select id="location-select" onchange="metaSelectChanged(this,'location')">
+        <option value="">— none —</option>
+        {% for loc in device_locations|default([]) %}
+        <option value="{{ loc }}">{{ loc }}</option>
+        {% endfor %}
+        <option value="__new__">➕ New location…</option>
+      </select>
+      <input type="text" id="location" name="location" value=""
+             placeholder="e.g. Living Room, Bedroom"
+             style="display:none;margin-top:0.4rem;">
+    </div>
+
     <div class="form-group">
       <label for="notes">Notes</label>
       <textarea id="notes" name="notes" placeholder="Optional notes…">{{ form_notes|default('') }}</textarea>