修复快捷助手无法注册快捷键导致无法呼出的问题

[SagoLu]

What this PR does

Before this PR:

After this PR:

Fixes #

Why we need it and why it was done in this way

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The following alternatives were considered:

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Breaking changes

If this PR introduces breaking changes, please describe the changes and the impact on users.

Special notes for your reviewer

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• PR: The PR description is expressive enough and will help future contributors
• Code: Write code that humans can understand and Keep it simple
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• Documentation: A user-guide update was considered and is present (link) or not required. You want a user-guide update if it's a user facing feature.

Release note

[Copilot]

Pull Request Overview

This PR refactors the mini_window shortcut handling by moving the QuickAssistant enablement check from registration time to runtime (when the shortcut is triggered). This allows the shortcut to be dynamically registered/unregistered based on the shortcut's enabled state, while checking the QuickAssistant feature flag only when the shortcut is actually invoked.

Key Changes

• Moved the QuickAssistant enabled check from the registerShortcuts function into the getShortcutHandler function for the mini_window shortcut
• Removed the early return condition during shortcut registration that prevented registration when QuickAssistant was disabled
• Added logging statements to track when the shortcut is processed during registration and when it's triggered

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