Fix audio AbortError race condition in all generation tabs

Use gr.skip() instead of gr.update() for audio/waveform/duration/seed
outputs during the initial "Generating..." status yield. This prevents
Gradio's StaticAudio component from starting a fetch that gets aborted
when the actual audio path arrives in the second yield.

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

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

src/ui/tabs/style_tab.py

@@ -163,21 +163,21 @@ def create_style_tab(
             if not style_audio:
                 yield (
                     gr.update(value="Please upload a style reference audio"),
-                    gr.update(),
-                    gr.update(),
-                    gr.update(),
-                    gr.update(),
-                    gr.update(),
+                    gr.skip(),
+                    gr.skip(),
+                    gr.skip(),
+                    gr.skip(),
+                    gr.skip(),
                 )
                 return
 
             yield (
                 gr.update(value="🔄 Generating..."),
                 gr.update(visible=True, value=0),
-                gr.update(),
-                gr.update(),
-                gr.update(),
-                gr.update(),
+                gr.skip(),  # Don't update audio yet
+                gr.skip(),  # Don't update waveform
+                gr.skip(),  # Don't update duration
+                gr.skip(),  # Don't update seed
             )
 
             try:
@@ -209,10 +209,10 @@ def create_style_tab(
                 yield (
                     gr.update(value=f"❌ Error: {str(e)}"),
                     gr.update(visible=False),
-                    gr.update(),
-                    gr.update(),
-                    gr.update(),
-                    gr.update(),
+                    gr.skip(),
+                    gr.skip(),
+                    gr.skip(),
+                    gr.skip(),
                 )
 
         generate_btn.click(