refactor(ssr): shared component partials own their CSS classes

Bake the Tailwind class base into the shared Selmer component partials so the
partials own their markup and callers pass only data + a small variant
(width / size / color). Applies across all four modals that share them
(bulk-code, invoices, sales-summaries, transaction-edit).

- typeahead / select / location-select / money-input / validated-field /
  button / a-button / a-icon-button: the class base, the validated-field
  has-error toggle, and the button color ladders now live in the .html. The
  sc/*-ctx fns pass width / variant / extra / color plus the non-class attrs
  (computed exactly as before, so every non-class attribute is unchanged).
- bulk-code templates updated to the new partial contracts; account-row pulls
  money-input and a-icon-button in via includes.

Verified: every component's class SET is identical to before across all
variants (14/14 oracle match -- buttons reorder/dedupe classes, CSS is
order-independent); bulk-code full render is DOM-equivalent to the pre-sweep
baseline (class-set + attr-order normalized) for empty / populated / error;
browser QA of bulk-code (full flow) and transaction-edit (open + render) clean,
no JS errors; invoices + sales-summaries compile and render through the same
sc/* fns.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

resources/templates/components/a-button.html

@@ -1,4 +1,4 @@
-<a class="{{ classes }}"{{ attrs|safe }}>
+<a class="{{ extra }} focus:ring-4 font-bold rounded-lg text-xs p-3 text-center mr-2 inline-flex items-center hover:scale-105 transition duration-100 justify-center {% if color = "secondary" %}text-white bg-blue-500 hover:bg-blue-600 focus:ring-blue-300 dark:bg-blue-600 dark:hover:bg-blue-700 focus:ring-blue-250{% elif color = "primary" %}text-white bg-green-500 hover:bg-green-600 focus:ring-green-300 dark:bg-green-600 dark:hover:bg-green-700 focus:ring-green-250{% elif color = "red" %}text-white bg-red-500 hover:bg-red-600 focus:ring-red-250 dark:bg-red-600 dark:hover:bg-red-700{% else %}bg-white dark:bg-gray-600 border-gray-300 dark:border-gray-700 text-gray-500 hover:text-gray-800 dark:text-gray-400 dark:hover:text-gray-100 font-medium border{% endif %}"{{ attrs|safe }}>
   {% if indicator %}
     <div class="htmx-indicator flex items-center">
       {% include "templates/components/spinner.html" %}