v0.4.0-beta.1

What's Changed

• feat(ios): embedded iOS simulator (no Simulator.app) — I1 headless frame acquisition by @dev-josias in #72
• feat(layout): move the AI assistant into the left sidebar (v6) by @dev-josias in #74
• feat(run): move the Run button to the top bar (prominent ▶ Run) by @dev-josias in #76
• fix(run): Run-on-Device works on Windows (cmd shim + verbatim-path cwd) by @dev-josias in #75
• feat(run): per-platform Run buttons (iOS/Android on macOS); drop duplicate run icon by @dev-josias in #77
• fix(emulator): back off frame-stream reconnects so a failing gRPC auth can't peg the UI by @dev-josias in #78
• fix(panel): drop the duplicate left-sidebar Terminal (v7 layout migration) by @dev-josias in #80
• feat(emulator): gRPC token auth — stream emulators launched outside UMIDE by @dev-josias in #81
• docs(screenshots): Windows hero shot — UMIDE with the live Android emulator by @dev-josias in #82
• fix(emulator): macOS gRPC token auth — right discovery dir + wire the native view by @dev-josias in #83
• release: prep v0.4.0-beta.1 (version, docs, beta testing infra) by @dev-josias in #79

Full Changelog: v0.3.3...v0.4.0-beta.1