fix: hide tauri window-state.json from note list + clean up dead code

[VariableThe]

Summary

• Filter window-state.json / .window-state from the note directory listing so Tauri's window state file doesn't appear as a fake note
• Remove dead code: window_utils.rs (unused show_and_focus_window function) and leftover test artifacts
• Fix unused Manager import in tray.rs
• Suppress eslint no-console warning in api.ts
• Fix minor clippy nit (unnecessary reference)

Checks

• tsc --noEmit: 0 errors
• eslint: 0 errors, 0 warnings
• vitest run: 35/35 pass
• cargo clippy: 0 actionable warnings

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 60be35cd-f58e-4e5c-8ad9-094e47115dcb

📥 Commits

Reviewing files that changed from the base of the PR and between 5607311 and 7a05f3d.

📒 Files selected for processing (4)

• src-tauri/src/lib.rs
• src-tauri/src/tray.rs
• src-tauri/src/window_utils.rs
• src/api.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/hide-window-state

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