Fix Windows cmd wrapper argument quoting

[Dimillian]

Motivation

• Windows .cmd/.bat invocations were being double-quoted when building the cmd.exe /C payload which caused the spawned process to be treated as a single invalid command, so the launcher must pass the payload as a raw argument to avoid extra quoting.

Description

• Use CommandExt and pass the cmd.exe /C payload with raw_arg(...) instead of arg(...) so the inner quoted command is not re-quoted by the Rust process API.
• Applied the fix in src-tauri/src/backend/app_server.rs for Codex app-server launches and in src-tauri/src/workspaces/commands.rs for the workspace open in command path when resolving .cmd/.bat targets.
• Existing non-Windows code paths and the PATH environment construction remain unchanged.

Testing

• Ran npm run lint which completed successfully.
• Ran npm run typecheck (tsc --noEmit) which completed successfully.
• Ran npm run test (Vitest) and all frontend tests passed (70 test files, 377 tests passed).
• Ran cargo check in src-tauri but it failed due to a missing system dependency (glib-2.0) in the environment, not related to the change.

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Codex Task

[Dimillian]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Nice work!

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