fix(responsive): improve mobile UX and fix SVG detection on architecture page

SUMMARY:
Fixed responsive design issues and SVG detection warnings on the
interactive architecture diagram. Improved mobile layout, padding,
and element sizing.

CHANGES:

1. Interactive Diagram JavaScript (interactive-diagram.js):
   - Fixed SVG tagName check to be case-insensitive (line 152)
     Was: svg.tagName !== 'svg'
     Now: svg.tagName && svg.tagName.toLowerCase() !== 'svg'
   - Updated service detail panel responsive styling (line 258)
     Added: w-full (full width on mobile)
     Added: lg:flex-1 (flex grow on desktop)
     Changed: p-6 to p-4 sm:p-6 (responsive padding)

2. Architecture Page HTML (architecture.html):
   - Improved container responsive padding (line 333)
     Changed: p-6 lg:p-8 to p-4 sm:p-6 lg:p-8
   - Reduced desktop gap for better layout (line 335)
     Changed: lg:gap-8 to lg:gap-6
   - Made SVG container full width on mobile (line 337)
     Added: w-full lg:w-auto
   - Improved SVG responsive sizing (line 342)
     Changed: max-w-md lg:max-w-lg
     To: max-w-sm sm:max-w-md lg:max-w-lg h-auto max-h-[500px]
   - Updated cache-busting version (line 515)
     Changed: v=20251019162000 to v=20251019163000

RESPONSIVE BREAKPOINTS:
- Mobile (default): Smaller padding (p-4), smaller max-width (max-w-sm)
- Tablet (sm: ≥640px): Medium padding (p-6), medium max-width (max-w-md)
- Desktop (lg: ≥1024px): Large padding (p-8), large max-width (max-w-lg)

FIXES:
✓ SVG detection warning resolved (case-insensitive tagName check)
✓ Mobile layout improved (better padding and sizing)
✓ Service detail panel responsive (full width on mobile)
✓ Diagram height constrained (max-h-[500px])

IMPACT:
Better mobile UX with appropriately sized elements and padding.
SVG detection should no longer log warnings in console.

🤖 Generated with Claude Code (https://claude.com/claude-code)

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

public/architecture.html

@@ -330,19 +330,19 @@
         </div>
       </div>
 
-      <div id="diagram-container" class="relative bg-white rounded-xl shadow-lg p-6 lg:p-8 border border-gray-200">
+      <div id="diagram-container" class="relative bg-white rounded-xl shadow-lg p-4 sm:p-6 lg:p-8 border border-gray-200">
         <!-- Flex container for side-by-side layout on desktop -->
-        <div class="flex flex-col lg:flex-row lg:items-start lg:gap-8">
+        <div class="flex flex-col lg:flex-row lg:items-start lg:gap-6">
           <!-- Interactive SVG -->
-          <div class="flex-shrink-0 flex justify-center lg:justify-start mb-6 lg:mb-0">
+          <div class="flex-shrink-0 flex justify-center lg:justify-start w-full lg:w-auto mb-6 lg:mb-0">
             <object
               data="/images/architecture-diagram-interactive.svg"
               type="image/svg+xml"
               id="interactive-svg-object"
-              class="w-full max-w-md lg:max-w-lg"
+              class="w-full max-w-sm sm:max-w-md lg:max-w-lg h-auto max-h-[500px]"
               aria-label="Interactive Tractatus Architecture Diagram">
               <!-- Fallback for browsers that don't support object tag -->
-              <img src="/images/architecture-diagram-interactive.svg" alt="Tractatus Architecture Diagram" class="w-full max-w-md lg:max-w-lg" />
+              <img src="/images/architecture-diagram-interactive.svg" alt="Tractatus Architecture Diagram" class="w-full max-w-sm sm:max-w-md lg:max-w-lg" />
             </object>
           </div>
 
@@ -512,7 +512,7 @@
   <script src="/js/scroll-animations.js"></script>
 
   <!-- Interactive Architecture Diagram (Phase 3) -->
-  <script src="/js/components/interactive-diagram.js?v=20251019162000"></script>
+  <script src="/js/components/interactive-diagram.js?v=20251019163000"></script>
 
   <!-- Footer Component -->
   <script src="/js/components/footer.js"></script>

public/js/components/interactive-diagram.js

@@ -149,7 +149,7 @@ class InteractiveDiagram {
         console.log('[InteractiveDiagram] Using documentElement as SVG');
       }
 
-      if (!svg || svg.tagName !== 'svg') {
+      if (!svg || (svg.tagName && svg.tagName.toLowerCase() !== 'svg')) {
         console.warn('[InteractiveDiagram] SVG diagram not found in contentDocument');
         return;
       }
@@ -255,7 +255,7 @@ class InteractiveDiagram {
     if (!panel) {
       panel = document.createElement('div');
       panel.id = 'service-detail-panel';
-      panel.className = 'flex-1 bg-white rounded-xl shadow-2xl p-6 border-2 lg:min-w-[400px]';
+      panel.className = 'w-full lg:flex-1 bg-white rounded-xl shadow-2xl p-4 sm:p-6 border-2 lg:min-w-[400px]';
       panel.style.borderColor = service.color;
 
       // Insert into the flex container for side-by-side layout