[EtienneLescot]

Pull Request: Implement the AI Edition Editor

This pull request implements the AI Edition—a next-generation screen recording editor for OpenScreen that ports the powerful data model and UX patterns of Axcut onto OpenScreen's native primitives. It introduces a comprehensive AI-assisted editing workflow, a modernized workbench shell, and multi-track timeline capabilities.

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High-Level Overview of the AI Edition

The AI Edition transforms OpenScreen from a simple recording utility into a state-of-the-art video editor, featuring:

1. Modernized Workbench Shell

• 4-Row Resizable Grid Layout: A highly polished, responsive layout consisting of a global Titlebar, a 7-column main workspace (with collapsible Left/Right panels and resize handles), and a bottom Timeline area.
• Dual-Theme Support: Built on a unified CSS variables design system offering sleek, premium Light and Dark themes.
• Project Management & Safety: Inline project renaming, save/save-as options, keyboard shortcuts (e.g., Undo/Redo, quick tool selections), and safety prompts that prevent accidental loss of unsaved changes.

2. Multi-Track Timeline & Region Editor

• Timeline Tracks: Reimplemented the timeline with multi-track support for zoom, trim, speed adjustments, and caption/text annotation tracks.
• Virtual Playback Engine: Real-time virtual timeline playback that seamlessly stitches kept clips together, skipping trimmed/cut segments.
• Contextual Region Inspector: Instantly inspects and modifies selected timeline elements—allowing live edits to zoom depth, playback speed, and text annotation styles (color, size, typewriter/pulse animations).

3. Integrated AI & Auto-Captioning

• Provider Registry: Secure integration with 8 LLM providers (including OpenAI, Anthropic, Google Gemini, and local Ollama) using safe OS-level credential storage.
• AI Chat Assistant: An interactive AI chat pane that allows users to query, edit, and orchestrate timeline modifications via conversational prompting.
• Automated Captioning: One-click speech-to-text transcription and automatic timeline caption generation with customizable word-wrap constraints.

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Architectural & Data Model Alignment

• Zustand State Store: Implements a unified projectStore tracking project ID, file assets, timeline revisions, and document dirty states.
• Ported Axcut Schemas: Seamlessly maps Axcut's data format (e.g., annotation regions, zoom zones) directly onto OpenScreen’s local database layout, completely in-tree without external Python sidecar dependencies.

Verification & Testing

• Typecheck: npx tsc --noEmit completes with 0 errors.
• Linting & Formatting: Verified clean Biome formatting across all modified files.
• Unit Tests: Passed all 353 tests across 44 test files in the test suite.

Summary by CodeRabbit

• New Features
  • Enabled the AI-assisted editor as the default workflow, including project/media management, AI chat with provider settings, cursor/webcam preview overlays, virtual timeline editing, and compact export flow.
• Bug Fixes
  • Improved handling of empty/invalid recordings during session saving.
  • Forwarded renderer console logs to the main process for easier diagnostics.
• Documentation
  • Published/updated OpenScreen, Axcut, and AI-Edition design and architecture/merge documentation.
• Tests
  • Added coverage for AI-edition document persistence and key editor UI components.
• Chores
  • Updated scanning rules to ignore design/worktree files.