Add workspace open targets and Ghostty support

[copypasteitworks]

Summary

Adds support for opening a workspace with broader open targets instead of editors only.

This PR:

• adds a new shell.openWorkspace websocket/native API method
• introduces shared WorkspaceOpenTargetId contracts
• exposes availableOpenTargets from the server config
• adds Ghostty as a supported workspace target
• keeps the existing favorite editor and primary Open button behavior unchanged
• updates the chat header open menu to show available workspace targets

Behavior

• If Ghostty is installed and supported on the current platform, it appears in the Open menu.
• If Ghostty is not installed, it is omitted from the available targets and nothing changes for the user.
• The primary Open button still uses the preferred editor and does not switch to Ghostty.

Validation

Passed:

• bun fmt
• bun lint
• bun typecheck

Targeted tests passed:

• bun run test src/open.test.ts src/wsServer.test.ts in apps/server
• bun run test src/openTarget.test.ts src/ws.test.ts in packages/contracts
• bun run test src/wsNativeApi.test.ts src/terminalStateStore.test.ts in apps/web

Note

Add Ghostty terminal as a workspace open target in the Open menu

• Adds a WORKSPACE_OPEN_TARGETS contract and WorkspaceOpenTargetId type in packages/contracts/src/openTarget.ts, plus a new shell.openWorkspace WebSocket method.
• Server computes availableOpenTargets (including Ghostty when detected) and returns it in getConfig; a new openWorkspace RPC routes to the Open service.
• Ghostty launch uses AppleScript (osascript) on macOS and the ghostty CLI on Linux; unsupported platforms return an error.
• OpenInPicker renders Ghostty alongside editors, invokes shell.openWorkspace for it, and skips updating the saved last-editor preference when Ghostty is selected.

^{Macroscope summarized f01e46d.}

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