fix: resolve setup pipeline crash and improve download robustness

[michojekunle]

Description

Resolves the setup pipeline block and improves file download resilience.

Specifically:

• Fixes the optimum-cli crash caused by a read-only config property in sentence-transformers by adding --library-name transformers to optimum-cli commands.
• Optimizes Python dependencies setup by verifying existing package installations before calling pip, preventing network/dependency conflicts (like hf-xet).
• Replaces standard JS fetch with curl (auto-resume -C - and --retry 10) for downloading the Whisper model.
• Adds a sequential Python download script for robust model downloading under slow or flaky connections.

Fixes #1

Type of change

• Bug fix
• New feature
• Refactoring (no functional changes)
• Documentation
• Build / CI
• Performance improvement

Areas affected

• Frontend (React / TypeScript)
• Backend (Rust / Tauri commands)
• Rust crate:
• Remote control (OSC / HTTP)
• Broadcast / NDI
• Theme Designer
• Bible data / search
• Audio / STT

Checklist

• I have tested this change locally
• bun run typecheck passes
• cargo clippy passes without warnings
• bun run test passes (if applicable)
• I have added tests for new functionality (if applicable)
• UI changes include a screenshot or recording below

Tested on

• macOS
• Windows
• Linux

Screenshots / recordings

[manuelinfosec]

Thanks for the contribution, @michojekunle. Does this fix an issue? It would be helpful if we know the issue it is solving (correctly reference) and add screenshots or recordings of your changes in action.