fix: CodeRabbit auto-fixes for PR #4

[coderabbitai]

This stacked PR contains CodeRabbit auto-fixes for #4.

Files modified:

• scripts/setup-sidecar.sh
• src-tauri/capabilities/default.json
• src-tauri/src/ai.rs
• src-tauri/src/sidecar.rs
• src-tauri/tauri.conf.json
• src/components/chat/ChatInput.tsx
• src/components/chat/ChatPanel.tsx
• src/hooks/useAiStream.ts
• src/lib/prompts.ts
• src/stores/projectStore.ts

[coderabbitai]

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[Szymon0C]

Fixes applied manually to PR #4 to avoid conflicts with Phase 3 code. Closing this auto-fix PR.