Dedupe menu admin CSS/markup, restore Mark Sold Out/Available labels

CSS redundancy cleanup on the online menu management feature:

- .menu-category was a byte-for-byte duplicate of the existing .panel
  class (background/border/border-radius/padding); folds it into
  .panel's shared selector group instead, keeping only what's not
  shared (no margin-bottom, since these sit in a grid whose own gap
  already spaces them)
- Several inline style="..." attributes were hand-copied verbatim
  between admin/menu.php's PHP template and admin/menu.js's client-
  side row/panel templates (price/sort/description cell formatting,
  category heading spacing, the empty-state row). Replaced with real
  CSS classes (.item-price-cell, .item-sort-cell, .item-desc-cell,
  .cat-name-heading, .cat-desc-text, .no-items-row td) so the styling
  lives in one place instead of two
- class="font-mono" was referenced four times but never defined
  anywhere in CSS (silently doing nothing); it's now a real one-line
  utility, which also fixes two previously-dead uses of it already
  sitting in admin/index.php
- .form-actions already existed as a class with its own margin-top,
  but every usage (two new modals here, plus a pre-existing one in
  admin/index.php) redundantly re-specified layout via inline style
  with a slightly different margin-top value each time; extended the
  shared class to own the whole pattern and dropped all three inline
  overrides
- Removed a no-op `justify-content: flex-start` (the default value)
  from the new .admin-toolbar

Caught and fixed a regression from the above before it shipped:
removing the inline margin-bottom override on the category heading
exposed that .panel h2's margin-bottom (from the existing panel
styles) has higher specificity than a bare .cat-name-heading class,
so the heading would have rendered with 5x the intended spacing.
Rescoped as .category-panel .cat-name-heading to reliably win.

Also restores the "Mark Sold Out" / "Mark Available" button wording
(both directions of the toggle, in both the PHP-rendered rows and
the two JS render paths) after it had been shortened to just "Sold
Out" / "Available".

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

styles.css

@@ -543,7 +543,8 @@
   .stat-card,
   .card,
   .login-card,
-  .panel {
+  .panel,
+  .menu-category {
     background: var(--surface);
     border: 1px solid var(--rule);
   }
@@ -1114,6 +1115,9 @@
   }
 
   .form-actions {
+    display: flex;
+    gap: 0.75rem;
+    align-items: center;
     margin-top: 1.75rem;
   }
 
@@ -1276,9 +1280,9 @@
     text-align: left;
   }
 
+  /* background/border come from the shared .panel rule above; no
+     margin-bottom here since these sit in a grid whose own gap spaces them */
   .menu-category {
-    background: var(--surface);
-    border: 1px solid var(--rule);
     border-radius: 0.25rem;
     padding: 2rem;
   }
@@ -1357,6 +1361,47 @@
     font-weight: normal;
   }
 
+  /* admin menu table: category panel header + item cell formatting.
+     Shared between admin/menu.php's server render and admin/menu.js's
+     client-side row/panel templates, so it lives here once instead of
+     being duplicated as inline styles in both places. */
+  .font-mono {
+    font-family: var(--font-mono);
+  }
+
+  /* two classes to reliably outrank .panel h2's margin-bottom above */
+  .category-panel .cat-name-heading {
+    margin-bottom: 0.25rem;
+  }
+
+  .cat-desc-text {
+    font-size: 0.88rem;
+  }
+
+  .no-items-row td {
+    text-align: center;
+    padding: 1.5rem 0;
+  }
+
+  .item-desc-cell {
+    font-size: 0.82rem;
+    margin-top: 0.2rem;
+  }
+
+  .item-price-cell {
+    color: var(--gold-bright);
+    font-weight: 500;
+  }
+
+  .item-sort-cell {
+    color: var(--ink-muted);
+    font-size: 0.8rem;
+  }
+
+  .item-badge-cell .eyebrow {
+    font-size: 0.68rem;
+  }
+
   /* ---------- admin modal dialogs ---------- */
   .admin-modal-backdrop {
     position: fixed;
@@ -1428,7 +1473,6 @@
 
   .admin-toolbar {
     display: flex;
-    justify-content: flex-start;
     gap: 0.75rem;
     align-items: center;
     margin-bottom: 2rem;