feat(12-02): wire all template strings to Alpine i18n store

- dashboard.html: headings, quick actions, empty states wired to x-text
- printers.html: h1, add button, h2 wired to x-text
- printers_new.html: all form labels (span pattern), options, submit buttons wired
- clients.html: headings, label, submit button wired
- client_detail.html: back link, section heading wired
- drivers.html: all headings, label, buttons, spinner wired
- packages.html: heading, description, table headers, empty state wired
- printer_detail.html: all dt/dd, section headings, copy buttons, script/export links wired with conditional Jinja2 for color/collate/client
- partials/printer_list.html: table headers, Yes/No cells (Alpine ternary), delete button wired
- partials/printer_edit_modal.html: edit trigger, modal title, all labels (span pattern), options, save/cancel wired
- partials/client_list.html: empty state, table headers wired
- partials/driver_list.html: table headers, unknown values, empty state wired
- Fix test_printers_library_no_form: check form element attribute instead of UI label string (now in i18n dict)

imptune/templates/partials/printer_list.html

@@ -1,6 +1,6 @@
 <div id="printer-list">
   {% if not grouped %}
-  <p>No printers configured yet.</p>
+  <p x-data x-text="$store.i18n.t('no_printers')">No printers configured yet.</p>
   {% else %}
   {% for client_name, printers in grouped.items() %}
   <section>
@@ -13,15 +13,15 @@
     <table>
       <thead>
         <tr>
-          <th>Name</th>
-          <th>IP Address</th>
-          <th>Port</th>
-          <th>Driver</th>
-          <th>Duplex</th>
-          <th>Color</th>
-          <th>Paper</th>
-          <th>Collate</th>
-          <th>Actions</th>
+          <th x-data x-text="$store.i18n.t('th_name')">Name</th>
+          <th x-data x-text="$store.i18n.t('th_ip')">IP Address</th>
+          <th x-data x-text="$store.i18n.t('th_port')">Port</th>
+          <th x-data x-text="$store.i18n.t('th_driver')">Driver</th>
+          <th x-data x-text="$store.i18n.t('th_duplex')">Duplex</th>
+          <th x-data x-text="$store.i18n.t('th_color')">Color</th>
+          <th x-data x-text="$store.i18n.t('th_paper')">Paper</th>
+          <th x-data x-text="$store.i18n.t('th_collate')">Collate</th>
+          <th x-data x-text="$store.i18n.t('th_actions')">Actions</th>
         </tr>
       </thead>
       <tbody>
@@ -32,16 +32,19 @@
           <td>{{ p.port_name }}</td>
           <td>{{ p.driver.original_filename if p.driver_id else '—' }}</td>
           <td>{{ p.duplex_mode }}</td>
-          <td>{{ 'Yes' if p.color_mode else 'No' }}</td>
+          <td x-data="{ val: {{ 'true' if p.color_mode else 'false' }} }"
+              x-text="val ? $store.i18n.t('yes') : $store.i18n.t('no')">{{ 'Yes' if p.color_mode else 'No' }}</td>
           <td>{{ p.paper_size }}</td>
-          <td>{{ 'Yes' if p.collate else 'No' }}</td>
+          <td x-data="{ val: {{ 'true' if p.collate else 'false' }} }"
+              x-text="val ? $store.i18n.t('yes') : $store.i18n.t('no')">{{ 'Yes' if p.collate else 'No' }}</td>
           <td>
             {% include "partials/printer_edit_modal.html" %}
             <button
               hx-delete="/printers/{{ p.id }}"
               hx-target="#printer-list"
               hx-swap="outerHTML"
-              hx-confirm="Delete '{{ p.name }}'?">
+              hx-confirm="Delete '{{ p.name }}'?"
+              x-data x-text="$store.i18n.t('delete')">
               Delete
             </button>
           </td>