perf: comprehensive optimization pass — caching, dedup, cleanup

fix: also hide video download button via CSS as belt-and-suspenders

fix: hide built-in Gradio video download button on output slots

fix: add video download link to waveform panel so it always reflects latest regen

fix: draw and hit-test segments by unique region to prevent overlap highlight bleed

fix: derive total_dur_s from ffprobe not CAVP frame count to prevent audio truncation

fix: load only AudioLDM2 VAE+vocoder subcomponents instead of full pipeline to prevent GPU OOM on long videos

Fix seed: default to -1 (random) instead of baked-in startup value

Randomize seed fields on every page load via JS

Fix video update after regen: delay+MutationObserver to survive Svelte re-render

Debug: log vidUpdate structure, handle all Gradio 5 video output shapes

Fix regen: capture pending slot/idx before hidePopup clears them

Fix regen: render=False on hidden Textboxes to stop 'Too many arguments' error

Debug: console.log in waveform click and global message listener

Fix regen: replace gr.State with gr.Textbox(visible=False) for regen plumbing

Fix blank iframe: set height=900 in launch() to override iFrameResizer height:0px

Fix UI layout: explicit scale=1 on all columns + CSS equal-width enforcement

Fix UI layout: replace gr.Group(visible=False) with gr.State for regen plumbing

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

Fix UI layout: move hidden regen textboxes into invisible gr.Group

Fix UI crash: replace hidden gr.Number with gr.Textbox for regen_seg inputs

Fix regen duration functions: add slot_id=None param to match regen function signatures

Fix regen: use properly-typed hidden Number/Textbox inputs for seg_idx and state_json

Fix regen: add _listenAndApply SSE handler + elem_id on output slots

Fix regen: bypass Svelte binding — call Gradio queue API directly from JS

Fix fireRegen: use correct prototype for textarea native setter

Disable SSR (ssr_mode=False) to fix regen Too many arguments

Fix regen: single-event trigger + generator-safe early-exit

Fix regen: embed state in trigger value, remove seg_state from inputs

Fix regen: CSS-hidden textboxes + remove _rtrig from outputs to fix Too many args

Fix fireRegen: clear+set pattern for Gradio 5 React .change()

Add regen debug logging + remove console.log noise

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Fix Too many arguments: separate gr.Group visibility from generation outputs

Fix waveform: popup via postMessage, regen, playhead, Too many args

Fix waveform rendering: use iframe srcdoc to ensure JS executes

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Sync video upload across all three model tabs

Add shared video upload above tabs — persists across model switches

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Fix MMAudio and HunyuanFoley video output retaining original audio

Calibrate GPU duration constants from measured H200 timings