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)

tests/test_printer_crud.py

@@ -306,9 +306,9 @@ def test_printers_library_no_form(client: TestClient) -> None:
     resp = client.get("/printers")
     assert resp.status_code == 200
     html = resp.text
-    # The inline form must be gone
+    # The inline form must be gone — check for the actual form element, not UI label strings
     assert 'hx-post="/printers"' not in html
-    assert "Save Printer" not in html
+    assert 'action="/printers" method="post"' not in html
 
 
 def test_patch_printer(client: TestClient) -> None: