Fix tabs onclick handlers by inlining components

**Problem:**
- HTab/VTab components received onclick as a parameter
- When binding events, codegen used parameter name "onclick" instead of actual function
- Runtime couldn't find handler function in WASM exports

**Root Cause:**
We don't support passing functions as component parameters yet. When a child
component uses onclick=onclick where onclick is a parameter, we bind the
string "onclick" instead of tracking which function was actually passed.

**Fix:**
Inlined HTab and VTab components back into parent components. Now lambdas
are directly on Button elements, so they generate proper synthetic handlers
(_lambda_0_Tabs, _lambda_1_Tabs, etc.) that get exported.

**Result:**
✅ All tab click handlers now work
✅ Handlers exported: _lambda_0_Tabs, _lambda_1_Tabs, _lambda_2_Tabs,
   _lambda_0_VerticalTabs, _lambda_1_VerticalTabs, _lambda_2_VerticalTabs

**TODO:**
Implement function pointers/delegates as component parameters to restore
component reusability (tracked in TYPE_SYSTEM_ROADMAP.md)

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

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

examples/tabs/Tabs.py

@@ -49,11 +49,19 @@ def VerticalTabs():
         setting_tab = value
 
     with Div(class_="vertical-tabs"):
-        # Vertical tab menu - using reusable VTab component!
+        # Vertical tab menu - inlined until we support function params
         with Div(class_="vertical-tab-menu"):
-            yield VTab(label="⚙️ General", active=setting_tab == 0, onclick=lambda: set_setting(0))
-            yield VTab(label="🔒 Privacy", active=setting_tab == 1, onclick=lambda: set_setting(1))
-            yield VTab(label="🚀 Advanced", active=setting_tab == 2, onclick=lambda: set_setting(2))
+            with Button(class_='vertical-tab active' if setting_tab == 0 else 'vertical-tab',
+                        onclick=lambda: set_setting(0)):
+                yield "⚙️ General"
+
+            with Button(class_='vertical-tab active' if setting_tab == 1 else 'vertical-tab',
+                        onclick=lambda: set_setting(1)):
+                yield "🔒 Privacy"
+
+            with Button(class_='vertical-tab active' if setting_tab == 2 else 'vertical-tab',
+                        onclick=lambda: set_setting(2)):
+                yield "🚀 Advanced"
 
         # Vertical tab content
         with Div(class_="vertical-tab-content"):
@@ -106,11 +114,19 @@ def Tabs(orientation=0):  # 0 = horizontal, 1 = vertical
         with P(class_="subtitle"):
             yield "Beautiful composition with TabMenu and TabPane components"
 
-        # Tab menu - using reusable HTab component!
+        # Tab menu - inlined until we support function params
         with Ul(class_="tab-menu"):
-            yield HTab(label="🏠 Home", active=tab_index == 0, onclick=lambda: set_tab(0))
-            yield HTab(label="👤 Profile", active=tab_index == 1, onclick=lambda: set_tab(1))
-            yield HTab(label="⚙️ Settings", active=tab_index == 2, onclick=lambda: set_tab(2))
+            with Li(class_='tab active' if tab_index == 0 else 'tab'):
+                with Button(onclick=lambda: set_tab(0)):
+                    yield "🏠 Home"
+
+            with Li(class_='tab active' if tab_index == 1 else 'tab'):
+                with Button(onclick=lambda: set_tab(1)):
+                    yield "👤 Profile"
+
+            with Li(class_='tab active' if tab_index == 2 else 'tab'):
+                with Button(onclick=lambda: set_tab(2)):
+                    yield "⚙️ Settings"
 
         # Tab panes - match/case for clean switching
         with Div(class_="tab-content"):