fix: theme toggle now properly handles auto mode

Remove data-theme attribute when mode="auto" instead of setting it to
"auto". Pico's OS-dark selector is :root:not([data-theme]), so any
value (even "auto") prevents dark-mode Pico styles. Add Pico form
element background vars and color-scheme: light to match active
theme.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

imptune/templates/partials/printer_list.html

@@ -18,6 +18,7 @@
                  ~ (printers | map(attribute='ip_address') | join(' ')) ~ ' '
                  ~ (printers | map(attribute='port_name') | join(' ')) ~ ' '
                  ~ (printers | selectattr('driver_id') | map(attribute='driver.original_filename') | join(' ')) ~ ' '
+                 ~ (printers | selectattr('driver_id') | map(attribute='driver.label') | join(' ')) ~ ' '
                  ~ client_name %}
   <section class="card card-flush"
            data-search="{{ gsearch | lower }}"
@@ -44,7 +45,7 @@
         </thead>
         <tbody>
           {% for p in printers %}
-          <tr data-search="{{ (p.name ~ ' ' ~ p.ip_address ~ ' ' ~ p.port_name ~ ' ' ~ client_name ~ ' ' ~ (p.driver.original_filename if p.driver_id else '')) | lower }}"
+          <tr data-search="{{ (p.name ~ ' ' ~ p.ip_address ~ ' ' ~ p.port_name ~ ' ' ~ client_name ~ ' ' ~ (p.driver.original_filename ~ ' ' ~ p.driver.label if p.driver_id else '')) | lower }}"
               x-data
               x-show="!$store.filter.q.trim() || $el.dataset.search.includes($store.filter.q.trim().toLowerCase())">
             <td>
@@ -54,7 +55,7 @@
             <td>
               {% if p.driver_id %}
               <span class="badge ok">{{ ico.i('check', 12) }}<span x-data x-text="$store.i18n.t('ready_to_export')">Ready</span></span>
-              <span class="cell-sub">{{ p.driver.original_filename }}</span>
+              <span class="cell-sub">{{ p.driver.label }}</span>
               {% else %}
               <span class="badge warn">{{ ico.i('alert', 12) }}<span x-data x-text="$store.i18n.t('needs_driver')">Driver needed</span></span>
               {% endif %}