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, hotkey registration, Fire TV actions, 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. This should remain an umbrella refactor rather than a single large rewrite.

Expected outcome

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

• Spotify actions/polling — tracked more specifically in Modularize Spotify page controller logic #10
• Fire TV actions
• Bindings/hotkeys
• Quick Access drag/reorder orchestration
• Layout/sidebar/render helpers

Constraints

• Preserve current behavior
• Prefer small, reviewable PRs over one large architectural rewrite
• Prefer 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