Live wire response + component display with OOB swaps on all examples

- All 6 examples show Component and Wire response as placeholders that
  fill with actual content when the demo is triggered (via OOB swaps)
- Wire response shows full wire content including component definitions
  (when not cached) and CSS style block
- Component display only includes defs the client doesn't already have,
  matching real sx_response() behaviour
- Add "Clear component cache" button to reset localStorage + in-memory
  component env so next interaction shows component download
- Rebuild tw.css with Tailwind v3.4.19 including sx content paths
- Optimize sx_response() CSS scanning to only scan sent comp_defs

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

shared/sx/helpers.py

@@ -402,8 +402,6 @@ def sx_response(source_or_component: str, status: int = 200,
 
     # On-demand CSS: scan source for classes, send only new rules
     from .css_registry import scan_classes_from_sx, lookup_rules, registry_loaded, lookup_css_hash, store_css_hash
-    from .jinja_bridge import _COMPONENT_ENV
-    from .types import Component as _Component
     new_classes: set[str] = set()
     cumulative_classes: set[str] = set()
     if registry_loaded():
@@ -411,10 +409,8 @@ def sx_response(source_or_component: str, status: int = 200,
         # Include pre-computed helper classes (menu bars, admin nav, etc.)
         new_classes.update(HELPER_CSS_CLASSES)
         if comp_defs:
-            # Use pre-computed classes for components being sent
-            for key, val in _COMPONENT_ENV.items():
-                if isinstance(val, _Component) and val.css_classes:
-                    new_classes.update(val.css_classes)
+            # Scan only the component definitions actually being sent
+            new_classes.update(scan_classes_from_sx(comp_defs))
 
         # Resolve known classes from SX-Css header (hash or full list)
         known_classes: set[str] = set()