Move fastext nav to page top, fix Settings header, add working search

- Fastext colour keys now lead every page but the index, since they're
  the only nav those pages carry; the index keeps them as its closing
  row since its own body is already the full nav.
- Settings page was missing page="settings" in its render_template
  call, so its header silently fell back to "P100 Index".
- Library's search form posted a q param the route never read; it now
  filters the cached Sonarr/Radarr lists and shows matching tiles.
- Discover gained a search bar that queries Ombi (already in front of
  TMDB/TVDB) and lets you add a result straight to Radarr/Sonarr,
  showing "Held" instead of a button for anything already in library.
- Fixed the Add button's success check, which read d.ok against a
  response that actually sets d.success — it reported FAILED even
  when the add worked.

templates/library.html

@@ -14,6 +14,22 @@
     <button class="tt-btn" type="submit">Search</button>
   </form>
 
+  {% if search_results is not none %}
+    <div class="tt-field">
+      <span>Results</span>
+      <span class="tt-field-meta">{{ search_results | length }} match{{ 'es' if search_results | length != 1 else '' }}</span>
+    </div>
+    {% if search_results %}
+      <div class="tt-tiles">
+        {% for it in search_results %}
+          {{ tile(it.title, it.kind, it.poster, it.year) }}
+        {% endfor %}
+      </div>
+    {% else %}
+      <p class="tt-empty">No matches for &ldquo;{{ q }}&rdquo;.</p>
+    {% endif %}
+  {% endif %}
+
   <div class="tt-field">
     <span>Holdings</span>
     <span class="tt-field-meta">
@@ -55,7 +71,7 @@
     {{ service_error('Radarr', radarr.error) }}
   {% endif %}
 
-  {% if recently_added %}
+  {% if not q and recently_added %}
     <div class="tt-field"><span>Newest In</span></div>
     <div class="tt-tiles">
       {% for it in recently_added %}