Add streamlined Simple UI music generation flow

[imattau]

Summary

• Add a streamlined five-step Simple UI for describing, remixing, generating, and downloading music.
• Make Simple UI the default generation flow while retaining access to advanced controls.
• Gate generation on model readiness and improve the responsive desktop layout.

This gives less-technical users a focused path through music creation without removing the existing advanced workflow.

Scope

The PR is limited to Simple UI components, event wiring, styling, and focused generation progress integration.

Out of scope:

• Tauri desktop shell and Flatpak packaging
• Model inference algorithms
• Hardware detection or platform-specific execution paths
• Training workflows

Risk and compatibility

• The primary risk is Gradio component wiring across the five UI steps.
• Existing advanced generation controls remain available through the Simple UI menu.
• CPU, CUDA, ROCm, MPS, XPU, and MLX execution paths are unchanged.
• Public Python interfaces outside the Gradio UI are unchanged.

The initial Simple UI implementation predates the current 200-line module policy. The large CSS, component construction, generation orchestration, and event registration sections should be decomposed by responsibility in focused follow-up work. Splitting them in this behavior PR would substantially increase the review surface and regression risk.

Regression checks

• .venv/bin/python -m unittest acestep.ui.gradio.events.wiring.simple_ui_test — 38 tests passed
• .venv/bin/python -m unittest acestep.ui.gradio.events.results.generation_progress_repaint_cache_test — 3 tests passed
• git diff --check upstream/main...HEAD — passed

Covered scenarios include navigation, remix behavior, instrumental lyrics handling, model readiness, generation progress, result downloads, responsive layout contracts, and failure fallback.

Reviewer notes

• Review the PR diff only; the Tauri/Flatpak work is intentionally isolated on a different branch.
• The test suite emits expected mocked generation-error logging while still passing.
• Recommended follow-up decomposition: extract Simple UI CSS, step builders, initialization, generation orchestration, and event registration into focused modules.

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