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lincube 33591a0a63 Add startup visual modes and attempt registry

Implement startup visual behavior, de-duplicate startup attempts, and improve failure UX.

Key changes:
- Add spec and docs for startup visuals and timing contract (.trae/specs and docs/LAUNCHER_STARTUP_VISUALS.md).
- Introduce StartupVisualPreferences contract and resolver; create SplashWindow via resolved mode.
- Add StartupAttemptRecord model and a file-backed StartupAttemptRegistry to persist and coordinate in-progress startup attempts (attach/adopt, soft/hard timeouts, IPC/connect state, lifecycle updates).
- Update LauncherFlowCoordinator to: adopt/attach to existing attempts, track IPC connection and soft/hard timeouts (30s/120s), show delayed UI state, attempt foreground recovery via public IPC, compose detailed launch result metadata, and mark registry states (soft timeout, detached waiting, succeeded, failed).
- Add TryActivateExistingInstanceAsync to attempt activating an existing desktop via IPC.
- Change failure flow: ShowFailureWindowAsync now returns user choice; ErrorWindow updated to present Activate/Wait/Open Logs/Exit semantics and new layouts/styles; improved button wiring and debug/dev mode handling.
- Add UI and resource tweaks (ErrorWindow and SplashWindow changes), project asset link for nightly logo, and unit tests for StartupVisualPreferences.

These changes prevent duplicate desktop processes during slow startups, provide clearer UX for delayed startups, and persist startup attempt state across Launcher invocations for safer recovery/attach behavior.

2026-04-23 09:03:35 +08:00

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Launcher Startup Visuals

This supplement records the startup rules that are shared by the launcher and the desktop host.

Timeout behavior

30 seconds is a soft timeout.
Soft timeout means still starting, not failed.
When the host process is alive or Public IPC is connected, Launcher keeps waiting and avoids launching another host process.
120 seconds is the hard timeout for desktop_not_visible.

Visual mode resolution

EnableSlideTransition = true resolves to SlideSplash and forces EnableFadeTransition = false.
EnableSlideTransition = false and EnableFadeTransition = false resolves to StaticSplash.
EnableSlideTransition = false and EnableFadeTransition = true resolves to Fade.

Fullscreen splash rules

Fullscreen splash uses the shared logo_nightly.png asset.
Slide splash enters from the right edge of the target screen and exits back to the right edge.
Static splash uses the same fullscreen black surface without motion.

Recovery rules

Closing Launcher during startup does not cancel the startup attempt.
Relaunching Launcher attaches to the active attempt instead of spawning a second desktop process.
If a host process is still alive during failure handling, Launcher offers activation or continued waiting before any retry.

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