feat(ui): dark theme redesign, fix image search and defaults

- Inline CSS in base.html (Inter, dark mode, sticky search, tabs, results)
- Remove HTMX/JS from templates; pagination via GET links
- Atmospheric side gradients + grid; wider column on large viewports
- Parse ?category= for HTML tabs (fixes Images category routing)
- Include bing_images, ddg_images, qwant_images in local_ported defaults
- Default listen port 5355; update Docker, compose, flake, README
- Favicon img uses /favicon/ proxy; preferences without inline JS

Made-with: Cursor

internal/views/templates/preferences.html

@@ -9,7 +9,7 @@
       <h2 class="pref-section-title">Appearance</h2>
       <div class="pref-row">
         <label for="theme-select">Theme</label>
-        <select name="theme" id="theme-select" onchange="this.form.submit()">
+        <select name="theme" id="theme-select">
           <option value="light" {{if eq .Theme "light"}}selected{{end}}>Light</option>
           <option value="dark" {{if eq .Theme "dark"}}selected{{end}}>Dark</option>
         </select>
@@ -70,7 +70,7 @@
       </div>
       <div class="pref-row">
         <div class="pref-row-info">
-          <label>Favicon Service</label>
+          <label for="pref-favicon">Favicon Service</label>
           <p class="pref-desc">Fetch favicons for result URLs. "None" is most private.</p>
         </div>
         <select name="favicon" id="pref-favicon">
@@ -105,26 +105,4 @@
     </div>
   </form>
 </div>
-
-<script>
-(function() {
-  // Load saved engine preferences
-  var savedEngines = JSON.parse(localStorage.getItem('samsa-engines') || 'null');
-  if (savedEngines) {
-    savedEngines.forEach(function(engine) {
-      var checkbox = document.querySelector('input[name="engine"][value="' + engine.id + '"]');
-      if (checkbox) checkbox.checked = engine.enabled;
-    });
-  }
-
-  // Save on submit
-  document.querySelector('.preferences-form').addEventListener('submit', function() {
-    var engines = [];
-    document.querySelectorAll('input[name="engine"]').forEach(function(cb) {
-      engines.push({ id: cb.value, enabled: cb.checked });
-    });
-    localStorage.setItem('samsa-engines', JSON.stringify(engines));
-  });
-})();
-</script>
 {{end}}