feat(app): git repo cloning dialog + shortcut

[anduimagui]

Issue for this PR

Closes#18241

Type of change

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

What does this PR do?

This makes cloning new repos into OpenCode much easier from the desktop app.

Before this, I was hopping out to GitHub Desktop to clone and then coming back. Now the flow is built in:

• open Clone Project in the desktop app
• paste a full URL (or shorthand like github.com/org/repo)
• OpenCode suggests a local destination
• choose a folder / adjust destination and clone directly

It also adds a default clone location in Settings > General > Projects, and fixes a path bug where the destination could end up nested like .../repo/repo.

How did you verify your code works?

• bun test --preload ./happydom.ts ./src/components/dialog-open-project.helpers.test.ts (packages/app)
• bun run typecheck (packages/app)
• bun run typecheck (packages/desktop)
• bun run test:clone (packages/desktop) - real clone test against https://github.com/anomalyco/opencode.git
• cargo check --manifest-path src-tauri/Cargo.toml (packages/desktop)
• Manual test: clone https://github.com/anomalyco/opencode resolves to /Users/<user>/Documents/code/opencode on macos without duplicate nesting

Screenshots / recordings

Checklist

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

If you do not follow this template your PR will be automatically rejected.

[github-actions]

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

[rekram1-node]

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