fix(fs): scope ThreadRng to ensure future is Send in save_asset

[VariableThe]

Summary

Fixes a future cannot be sent between threads safely compilation error in save_asset caused by rand::thread_rng() (which contains Rc<UnsafeCell<...>> and is not Send) being held across an .await point.

Changes

• src-tauri/src/commands/fs.rs: Scoped rand::thread_rng() inside a block so the ThreadRng is dropped before tokio::fs::write().await, making the future Send.
• Removed memo-adjacent SHORTCUT_VOICE_MEMO key from settingsKeys.ts.

Background

This branch (from main) cherry-picks the image/asset support commits from feature/v0.5.9-image-support (save_asset, read_asset, image paste widget, etc.) and applies the Send fix on top. No memo/voice files are included.

Closes the future: Send build error.

[coderabbitai]

Caution

Review failed

The head commit changed during the review from 79ca882 to e6737a9.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/save-asset-send

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