Split apps/tauri/src/main.ts into smaller controller modules

[postigodev]

Summary

apps/tauri/src/main.ts still owns too much wiring: event binding, async actions, polling, drag-and-drop, and page-specific orchestration.

Why this matters

The file is workable, but it raises the entry cost for contributors and makes small behavior changes harder to reason about.

Expected outcome

Split the file into smaller modules by concern, for example:

• Spotify actions/polling
• Fire TV actions
• Bindings/hotkeys
• Layout/sidebar/render helpers

Constraints

• Preserve current behavior
• Prefer small, readable modules over introducing a large abstraction layer
• Keep the app biased toward explicit control flow

Likely files

• apps/tauri/src/main.ts
• apps/tauri/src/features/*
• apps/tauri/src/pages/*
• new controller/helper modules under apps/tauri/src