feat(desktop): add deeplink actions for pause/resume + mic/camera switching

[albertsalgueda]

Summary

Extends the cap-desktop://action?value=… deeplink surface so external clients (e.g. a Raycast extension) can drive recording end-to-end. The repo already supported StartRecording / StopRecording / OpenEditor / OpenSettings; this PR adds the rest of the verbs the issue calls out:

• pause_recording
• resume_recording
• toggle_pause_recording
• set_mic_input (with label: Option<String> — null clears the mic, matching the existing tauri command)
• set_camera_input (with id: Option<DeviceOrModelID> — null clears the camera)

Each new variant delegates to the existing tauri command of the same name (crate::recording::pause_recording, crate::set_mic_input, etc.), so behavior matches what the in-app UI already does.

Addresses the deeplinks half of #1540. The Raycast extension itself is intentionally out of scope for this PR — it's a separate deliverable that lives in its own repo, and shipping the underlying deeplinks first means the extension can be iterated on without further desktop-side churn.

Example URLs

cap-desktop://action?value=%22pause_recording%22
cap-desktop://action?value=%22resume_recording%22
cap-desktop://action?value=%22toggle_pause_recording%22
cap-desktop://action?value=%7B%22set_mic_input%22%3A%7B%22label%22%3A%22MacBook%20Pro%20Microphone%22%7D%7D
cap-desktop://action?value=%7B%22set_camera_input%22%3A%7B%22id%22%3A%7B%22DeviceID%22%3A%22FaceTime%20HD%20Camera%22%7D%7D%7D

(value is the JSON-encoded DeepLinkAction with serde rename_all = "snake_case", same as the existing variants.)

Test plan

• cargo check -p cap-desktop
• Build the desktop app and start a recording, then trigger each new deeplink from the terminal (open "cap-desktop://action?value=…" on macOS / start "" equivalent on Windows) and confirm the in-app state matches.

Closes #1540 (deeplinks side).

Greptile Summary

This PR extends the DeepLinkAction enum with five new verbs — pause_recording, resume_recording, toggle_pause_recording, set_mic_input, and set_camera_input — and wires each to the matching existing tauri command, enabling external clients to drive recording state end-to-end via deeplink.

• New enum variants follow existing serde rename_all = "snake_case" conventions and match the example URL shapes in the PR description exactly.
• Each execute branch mirrors the corresponding Tauri command call already used elsewhere in the file (e.g., StartRecording already calls crate::set_mic_input / crate::set_camera_input with the same argument shape).
• No new state, no new error paths, and no changes to existing variants.

Confidence Score: 5/5

Safe to merge — the change is a minimal, additive delegation to existing tauri commands with no modifications to existing behavior.

Each new deeplink variant is a one-liner that calls a pre-existing, well-tested tauri command using the same call site pattern already established in StartRecording. Serde attributes are correct, DeviceOrModelID already implements Deserialize (used by the existing StartRecording variant), and the skip_camera_window: None argument for SetCameraInput is consistent with how StartRecording calls the same function.

No files require special attention.

Important Files Changed

Filename	Overview
apps/desktop/src-tauri/src/deeplink_actions.rs	Adds PauseRecording, ResumeRecording, TogglePauseRecording, SetMicInput, and SetCameraInput deeplink variants, each delegating to the matching existing tauri command; follows established patterns in the file exactly.

_{Reviews (1): Last reviewed commit: "feat(desktop): add deeplink actions for ..." | Re-trigger Greptile}