Defer shortcut setup to MainActivity

[Copilot]

Shortcuts were being set up (and torn down) in Application.onCreate(), which runs in every process and requires eagerly reading UiStore. They were also being explicitly removed when the user hid the app icon.

Changes

• MainApplication: Remove setupShortcuts() and its uiStore dependency entirely
• MainActivity: Call setupShortcuts() in onCreate(); bail early if hideAppIcon is set — no removal needed
• AppSettingsActivity: Drop ShortcutManagerCompat.removeAllDynamicShortcuts() from onHideIconChange() — disabling the launcher alias is sufficient; existing shortcuts don't need to be purged

Ports #214.

[Copilot]

Pull request overview

This PR moves dynamic shortcut creation out of Application.onCreate() (which runs in all processes) and into MainActivity, and stops explicitly purging shortcuts when the launcher alias is disabled.

Changes:

• Removed shortcut setup (and UiStore dependency) from MainApplication.
• Added shortcut setup to MainActivity.onCreate(), skipping creation when hideAppIcon is enabled.
• Removed removeAllDynamicShortcuts() call from AppSettingsActivity when hiding the app icon.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
app/src/main/java/com/github/kr328/clash/MainApplication.kt	Removes dynamic shortcut setup from app startup to avoid running it in non-main processes.
app/src/main/java/com/github/kr328/clash/MainActivity.kt	Creates dynamic shortcuts during activity creation instead of application startup.
app/src/main/java/com/github/kr328/clash/AppSettingsActivity.kt	Stops purging shortcuts when toggling the launcher alias state.

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