fix: use system claude binary in packaged Electron app

[JustYannicc]

What Changed

Default pathToClaudeCodeExecutable to "claude" (resolved via PATH) instead of leaving it unset, which lets the SDK fall back to its bundled cli.js.

Why

The claude-agent-sdk bundles its own cli.js inside node_modules. In the packaged Electron app this file gets packed into the asar archive, where child_process.spawn cannot execute it — the Claude Code process exits with code 1 immediately after session start.

Using the system claude binary matches how the Codex adapter already defaults to "codex".

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Fix Claude binary path to default to system claude in packaged Electron app

In ClaudeAdapter.ts, pathToClaudeCodeExecutable is now always set in queryOptions, defaulting to "claude" when no binaryPath is provided. Previously, the field was omitted entirely when binaryPath was absent, which caused the packaged Electron app to fail to locate the system Claude binary.

^{Macroscope summarized 12685fb.}

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