Fix UI layout: move hidden regen groups outside gr.Row

gr.Group(visible=False) was inside gr.Row, acting as a third column
and breaking the two-column layout. Moved outside the Row block,
at Tab level, so they have zero layout impact.

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

app.py

@@ -1763,15 +1763,15 @@ with gr.Blocks(title="Generate Audio for Video", css=_SLOT_CSS, js=_GLOBAL_JS) a
                     taro_samples    = gr.Slider(label="Generations", minimum=1, maximum=MAX_SLOTS, value=1, step=1)
                     taro_btn        = gr.Button("Generate", variant="primary")
 
-                with gr.Group(visible=False):
-                    # Hidden regen plumbing — zero DOM footprint, do NOT remove
-                    taro_regen_seg   = gr.Textbox(value="0", elem_id="taro_regen_seg")
-                    taro_regen_state = gr.Textbox(value="", elem_id="taro_regen_state")
-
                 with gr.Column():
                     (taro_slot_grps, taro_slot_vids,
                      taro_slot_waves) = _make_output_slots("taro")
 
+            # Hidden regen plumbing — outside Row so no layout impact
+            with gr.Group(visible=False):
+                taro_regen_seg   = gr.Textbox(value="0", elem_id="taro_regen_seg")
+                taro_regen_state = gr.Textbox(value="", elem_id="taro_regen_state")
+
             for trigger in [taro_video, taro_steps, taro_cf_dur]:
                 trigger.change(
                     fn=_on_video_upload_taro,
@@ -1871,15 +1871,15 @@ with gr.Blocks(title="Generate Audio for Video", css=_SLOT_CSS, js=_GLOBAL_JS) a
                     mma_samples     = gr.Slider(label="Generations", minimum=1, maximum=MAX_SLOTS, value=1, step=1)
                     mma_btn         = gr.Button("Generate", variant="primary")
 
-                with gr.Group(visible=False):
-                    # Hidden regen plumbing — zero DOM footprint, do NOT remove
-                    mma_regen_seg   = gr.Textbox(value="0", elem_id="mma_regen_seg")
-                    mma_regen_state = gr.Textbox(value="", elem_id="mma_regen_state")
-
                 with gr.Column():
                     (mma_slot_grps, mma_slot_vids,
                      mma_slot_waves) = _make_output_slots("mma")
 
+            # Hidden regen plumbing — outside Row so no layout impact
+            with gr.Group(visible=False):
+                mma_regen_seg   = gr.Textbox(value="0", elem_id="mma_regen_seg")
+                mma_regen_state = gr.Textbox(value="", elem_id="mma_regen_state")
+
             mma_samples.change(
                 fn=_update_slot_visibility,
                 inputs=[mma_samples],
@@ -1963,15 +1963,15 @@ with gr.Blocks(title="Generate Audio for Video", css=_SLOT_CSS, js=_GLOBAL_JS) a
                     hf_samples      = gr.Slider(label="Generations", minimum=1, maximum=MAX_SLOTS, value=1, step=1)
                     hf_btn          = gr.Button("Generate", variant="primary")
 
-                with gr.Group(visible=False):
-                    # Hidden regen plumbing — zero DOM footprint, do NOT remove
-                    hf_regen_seg    = gr.Textbox(value="0", elem_id="hf_regen_seg")
-                    hf_regen_state  = gr.Textbox(value="", elem_id="hf_regen_state")
-
                 with gr.Column():
                     (hf_slot_grps, hf_slot_vids,
                      hf_slot_waves) = _make_output_slots("hf")
 
+            # Hidden regen plumbing — outside Row so no layout impact
+            with gr.Group(visible=False):
+                hf_regen_seg    = gr.Textbox(value="0", elem_id="hf_regen_seg")
+                hf_regen_state  = gr.Textbox(value="", elem_id="hf_regen_state")
+
             hf_samples.change(
                 fn=_update_slot_visibility,
                 inputs=[hf_samples],