fix: register MonetHelper overlay receiver in LaunchActivity

[waifucon]

Commit 9fff4fd1 introduced an OverlayChangeReceiver inside MonetHelper to listen for the android.intent.action.OVERLAY_CHANGED broadcast intent. The goal was to dynamically refresh the active theme when system Monet colors changed. However, the registerReceiver and unregisterReceiver methods were never actually invoked, meaning the receiver was inactive and users had to manually restart the app to see theme changes.

This PR correctly wires the receiver by adding:

• MonetHelper.registerReceiver(this) in LaunchActivity#onCreate
• MonetHelper.unregisterReceiver(this) in LaunchActivity#onDestroy

This ensures that the broadcast receiver is properly bound to the app's lifecycle, allowing the app theme to refresh seamlessly on the fly.

Summary by Sourcery

Bug Fixes:

• Register and unregister the Monet overlay receiver with LaunchActivity's lifecycle so theme colors refresh automatically when system Monet colors change.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

LaunchActivity now registers and unregisters MonetHelper’s overlay receiver with its activity lifecycle, enabling automatic theme refreshes when Android Monet colors change without requiring an app restart.

Sequence diagram for Monet overlay-driven theme refresh

sequenceDiagram
    participant LaunchActivity
    participant MonetHelper
    participant Android

    LaunchActivity->>MonetHelper: registerReceiver(this)
    Android-->>MonetHelper: OVERLAY_CHANGED
    MonetHelper->>MonetHelper: refresh active theme
    LaunchActivity->>MonetHelper: unregisterReceiver(this)

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File-Level Changes

Change	Details	Files
Bind MonetHelper’s overlay-change receiver to LaunchActivity’s lifecycle.	Import MonetHelper into LaunchActivity. Register the receiver during onCreate. Unregister the receiver during onDestroy.	TMessagesProj/src/main/java/org/telegram/ui/LaunchActivity.java

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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