feat: implement cap deep links and raycast extension

[d3vv3r]

Closes #1540

Greptile Overview

Greptile Summary

This PR implements Cap deep link support and a Raycast extension for controlling recordings via keyboard shortcuts. The implementation adds a new cap:// URL scheme that enables external applications to control Cap's recording functionality.

Key changes:

• Added four new deep link actions: StartDefaultRecording, PauseRecording, ResumeRecording, and StopRecording to deeplink_actions.rs
• Registered the cap:// URL scheme in Tauri configuration alongside the existing cap-desktop:// scheme
• Created a Raycast extension with four commands that trigger these deep links
• Deep link parsing now checks for cap:// scheme first before falling back to the existing action-based parsing
• Pause and resume actions properly emit RecordingEvent::Paused and RecordingEvent::Resumed events to update the UI

Implementation quality:
The Rust implementation follows repository conventions with proper error handling and async patterns. The pause/resume handlers correctly access the current recording state and emit the appropriate events. The StartDefaultRecording action provides a sensible default (first display, Studio mode, system audio enabled) for quick recording starts.

Confidence Score: 5/5

• This PR is safe to merge with no blocking issues
• The implementation is clean and follows existing patterns. The deep link handlers properly reuse existing recording methods, emit correct events, and handle errors appropriately. All TypeScript code is simple and follows Raycast conventions.
• No files require special attention

Important Files Changed

Filename	Overview
apps/desktop/src-tauri/src/deeplink_actions.rs	Added deep link handlers for pause/resume/start-default recording actions with proper event emission
apps/desktop/src-tauri/tauri.conf.json	Registered new cap:// URL scheme alongside existing cap-desktop:// scheme for deep links
extensions/raycast/package.json	Created Raycast extension manifest with four commands for recording control
extensions/raycast/src/start-recording.ts	Opens cap://record deep link to trigger default recording start
extensions/raycast/src/stop-recording.ts	Opens cap://stop deep link to stop active recording
extensions/raycast/src/pause-recording.ts	Opens cap://pause deep link to pause active recording
extensions/raycast/src/resume-recording.ts	Opens cap://resume deep link to resume paused recording

Sequence Diagram

sequenceDiagram
    participant Raycast as Raycast Extension
    participant OS as Operating System
    participant Tauri as Tauri Deep Link Handler
    participant Parser as DeepLinkAction Parser
    participant App as Cap Desktop App
    participant Recording as Recording Module
    participant Frontend as Desktop Frontend

    Raycast->>OS: open("cap://record")
    OS->>Tauri: Route cap:// URL
    Tauri->>Parser: Parse URL to DeepLinkAction
    Parser->>Parser: Match domain (record/stop/pause/resume)
    Parser-->>Tauri: Return DeepLinkAction variant
    Tauri->>App: execute(StartDefaultRecording)
    App->>Recording: list_displays()
    Recording-->>App: Display list
    App->>App: Select first display
    App->>Recording: start_recording(inputs)
    Recording-->>App: Recording started
    
    Note over Raycast,Frontend: Pause Flow
    Raycast->>OS: open("cap://pause")
    OS->>Tauri: Route cap:// URL
    Tauri->>Parser: Parse URL
    Parser-->>Tauri: DeepLinkAction::PauseRecording
    Tauri->>App: execute(PauseRecording)
    App->>Recording: recording.pause()
    Recording-->>App: Ok()
    App->>Frontend: RecordingEvent::Paused.emit()
    
    Note over Raycast,Frontend: Resume Flow
    Raycast->>OS: open("cap://resume")
    OS->>Tauri: Route cap:// URL
    Tauri->>Parser: Parse URL
    Parser-->>Tauri: DeepLinkAction::ResumeRecording
    Tauri->>App: execute(ResumeRecording)
    App->>Recording: recording.resume()
    Recording-->>App: Ok()
    App->>Frontend: RecordingEvent::Resumed.emit()
    
    Note over Raycast,Frontend: Stop Flow
    Raycast->>OS: open("cap://stop")
    OS->>Tauri: Route cap:// URL
    Tauri->>Parser: Parse URL
    Parser-->>Tauri: DeepLinkAction::StopRecording
    Tauri->>App: execute(StopRecording)
    App->>Recording: stop_recording()
    Recording-->>App: Recording stopped

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Bounty Claim

/claim #1540

Walkthrough

I have implemented the deep link support and Raycast extension as requested.

[d3vv3r]

I've implemented several stability fixes for the Windows recording pipeline:

• Balanced Media Foundation/COM initialization via ThreadInitGuard and proper thread_uninit calls to prevent crashes in the recording save and start/stop cycles.
• Fixed a GPU adapter mismatch that was causing Cap to default to the WARP software rasterizer on Windows even when hardware acceleration was available.
• Optimized the YUV converter to use shared pipelines, reducing GPU memory overhead.
• Fixed various type mismatches and syntax errors in the recording pipelines discovered during the stability audit.

Verification was successful on Windows, showing consistent recording starts and saves without the previous instability. A proof of verification video is available.

display.mp4

Closes #1540