feat(desktop): Support Portable Mode

[1506086927]

Issue for this PR

Closes #

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

This PR introduces a "Portable Mode", allowing users to run the app directly from a USB drive or custom directory without leaving data in the system's default AppData folder.

To achieve this, I made the following changes:

1. Added a "Portable mode" toggle in both V1 and V2 General Settings.
2. Intercepted the Electron lifecycle early in packages/desktop/src/main/index.ts. If it detects the portable directory, it redirects app.setPath("userData", ...) and overrides environment variables (like XDG_DATA_HOME) to a local opencode-data folder next to the executable.
3. Handled the toggle via IPC (packages/desktop/src/main/ipc.ts), triggering a native confirmation dialog that safely restarts the application to apply the new paths. If the user cancels the dialog, the promise correctly rejects so the frontend UI switch reverts its state.
4. Added the required i18n localization keys for all supported languages.

This approach works because redirecting the userData path before the app emits the ready event ensures all subsequent Chromium processes, local DBs, and the sidecar node server read/write strictly from the isolated directory.

How did you verify your code works?

1. Built the app using unpacked mode locally (bunx electron-builder --dir).
2. Enabled Portable Mode in settings: Verified the native confirmation dialog appears, the app restarts, and the opencode-data folder (with the .portable marker) is successfully created next to the .exe.
3. Created a new session and checked the filesystem: Confirmed logs, config, and state were stored inside opencode-data rather than %APPDATA%.
4. Disabled Portable Mode in settings: Verified the app deletes the .portable marker, restarts, and gracefully falls back to the system default directory.
5. Clicked "Cancel" on the confirmation dialog and ensured the UI switch properly bounced back without writing any files.

Screenshots / recordings

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Found one potentially related PR:

PR #8963: feat: add directory override env vars and OPENCODE_APPNAME for portable mode and profile isolation
#8963

This PR is related because it also addresses portable mode functionality and environment variable handling for portable/profile isolation. You may want to review it to ensure there's no overlapping work or to understand any previous design decisions around portable mode.

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍

[github-actions]

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