feat(app): Gradio shell with sidebar nav and empty mode tabs

app.py

@@ -0,0 +1,121 @@
+# app.py
+"""LTX 2.3 All-in-One — Gradio entry point."""
+from __future__ import annotations
+
+import os
+import pathlib
+import sys
+
+import gradio as gr
+
+import modes
+import ui
+
+
+# ---------------------------------------------------------------------------
+# Bootstrap — runs once on cold start.
+# ---------------------------------------------------------------------------
+
+def _on_spaces() -> bool:
+    return bool(os.environ.get("SPACES_ZERO_GPU"))
+
+
+COMFYUI_REPO = "https://github.com/comfyanonymous/ComfyUI.git"
+# Pinned to the same commit the local git submodule uses (set in Task 5).
+# Override via env var only when intentionally testing a different ComfyUI version.
+COMFYUI_COMMIT = os.environ.get(
+    "LTX23_AIO_COMFYUI_COMMIT",
+    "eb0686bbb60c83e44c3a3e4f7defd0f589cfef10",
+)
+
+CUSTOM_NODES_PINNED: list[tuple[str, str]] = [
+    ("https://github.com/Lightricks/ComfyUI-LTXVideo.git", "main"),
+    ("https://github.com/kijai/ComfyUI-KJNodes.git", "main"),
+    ("https://github.com/rgthree/rgthree-comfy.git", "main"),
+    ("https://github.com/Kosinkadink/ComfyUI-VideoHelperSuite.git", "main"),
+    ("https://github.com/pythongosssss/ComfyUI-Custom-Scripts.git", "main"),
+]
+
+
+def _git_clone(url: str, dst: pathlib.Path, ref: str) -> None:
+    import subprocess
+    subprocess.check_call(["git", "clone", "--depth", "1", "--branch", ref, url, str(dst)])
+
+
+def _bootstrap() -> None:
+    on_spaces = _on_spaces()
+    comfy_dir = pathlib.Path("/data/comfyui" if on_spaces else "comfyui")
+
+    if on_spaces and not comfy_dir.exists():
+        comfy_dir.parent.mkdir(parents=True, exist_ok=True)
+        _git_clone(COMFYUI_REPO, comfy_dir, ref=COMFYUI_COMMIT)
+        for node_url, node_ref in CUSTOM_NODES_PINNED:
+            name = node_url.rstrip(".git").rsplit("/", 1)[-1]
+            _git_clone(node_url, comfy_dir / "custom_nodes" / name, ref=node_ref)
+        # Install custom node deps
+        import subprocess
+        for cn in (comfy_dir / "custom_nodes").iterdir():
+            req = cn / "requirements.txt"
+            if req.exists():
+                subprocess.check_call([sys.executable, "-m", "pip", "install", "-r", str(req)])
+
+    if str(comfy_dir) not in sys.path:
+        sys.path.insert(0, str(comfy_dir))
+    os.environ.setdefault(
+        "COMFY_MODELS_DIR",
+        str(pathlib.Path("/data/models") if on_spaces else (comfy_dir / "models")),
+    )
+
+
+_bootstrap()
+
+
+# ---------------------------------------------------------------------------
+# Gradio app
+# ---------------------------------------------------------------------------
+
+_CUSTOM_CSS = """
+.status-card { padding: 14px 16px; border-radius: 10px; background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08); }
+.status-row { display: flex; gap: 14px; align-items: center; margin-bottom: 8px; }
+.status-stage { font-weight: 600; }
+.status-meta { font-size: 12px; opacity: 0.75; }
+.status-bar { height: 6px; background: rgba(255,255,255,0.08); border-radius: 99px; overflow: hidden; }
+.status-fill { height: 100%; background: linear-gradient(90deg,#6ea8fe,#8de9fe); transition: width .3s; }
+.status-mem { font-size: 11px; opacity: 0.6; margin-top: 6px; font-family: ui-monospace, monospace; }
+"""
+
+
+def build_app() -> gr.Blocks:
+    with gr.Blocks(
+        theme=gr.themes.Soft(),
+        title="LTX 2.3 All-in-One",
+        css=_CUSTOM_CSS,
+    ) as app:
+        gr.Markdown("# ⚡ LTX 2.3 All-in-One")
+        with gr.Row():
+            with gr.Column(scale=1, min_width=200):
+                _render_sidebar()
+            with gr.Column(scale=4):
+                _render_mode_panels()
+    return app
+
+
+def _render_sidebar() -> None:
+    gr.Markdown("### Modes")
+    for name, mode in modes.MODE_REGISTRY.items():
+        gr.Markdown(f"- {mode.icon} {mode.label}")
+    gr.Markdown("---\n### Models")
+    gr.Button("Unload all models", variant="secondary")
+
+
+def _render_mode_panels() -> None:
+    with gr.Tabs():
+        for name, mode in modes.MODE_REGISTRY.items():
+            with gr.Tab(label=f"{mode.icon} {mode.label}"):
+                gr.Markdown(f"## {mode.label}")
+                gr.Markdown(f"_(Mode `{name}` form goes here — built in Task 22.)_")
+
+
+if __name__ == "__main__":
+    app = build_app()
+    app.launch(server_name="0.0.0.0", server_port=7860)