Fix formula pages mobile responsiveness; fix missing mobile tabs

- Custom Formulas and Timeclock tabs were completely missing from the mobile
  dropdown selector, making them unreachable on phones; also adds AI Profile
  and Online Payments which were similarly absent
- Formula library header: flex-column on mobile so title and button stack
  cleanly instead of colliding
- Filter bar: icon-only button gets a visible label on mobile; added col-12
  so it renders full-width correctly at xs
- Import modal: add modal-dialog-scrollable so body scrolls on small screens;
  wrap field table in table-responsive to prevent horizontal overflow
- Settings card header: flex-column on mobile + flex-wrap on button group
  so the three buttons don't overflow off the right edge

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/PowderCoating.Web/Views/FormulaLibrary/Index.cshtml

@@ -9,7 +9,7 @@
 }
 
 <div class="container-fluid px-4">
-    <div class="d-flex align-items-center justify-content-between mb-4">
+    <div class="d-flex align-items-start align-items-sm-center justify-content-between flex-column flex-sm-row gap-3 mb-4">
         <div>
             <h1 class="h3 mb-1">
                 <i class="bi bi-collection me-2 text-primary"></i>Community Formula Library
@@ -17,7 +17,7 @@
             <p class="text-muted mb-0">Browse and import pricing formulas shared by the Powder Coating Logix community.</p>
         </div>
         <a asp-controller="CompanySettings" asp-action="Index" asp-fragment="custom-formulas"
-           class="btn btn-outline-secondary">
+           class="btn btn-outline-secondary flex-shrink-0">
             <i class="bi bi-gear me-1"></i>My Formulas
         </a>
     </div>
@@ -47,9 +47,9 @@
                     <input type="text" name="industryHint" value="@industryHint"
                            class="form-control" placeholder="HVAC, Automotive&hellip;" />
                 </div>
-                <div class="col-md-1">
+                <div class="col-12 col-md-1">
                     <button type="submit" class="btn btn-primary w-100">
-                        <i class="bi bi-funnel-fill"></i>
+                        <i class="bi bi-funnel-fill"></i><span class="d-md-none ms-1">Apply Filters</span>
                     </button>
                 </div>
             </form>
@@ -194,7 +194,7 @@
 
 @* Import Preview Modal *@
 <div class="modal fade" id="importModal" tabindex="-1" aria-labelledby="importModalLabel" aria-hidden="true">
-    <div class="modal-dialog modal-lg">
+    <div class="modal-dialog modal-lg modal-dialog-scrollable">
         <div class="modal-content">
             <div class="modal-header">
                 <h5 class="modal-title" id="importModalLabel">