Refactor: Secure literal search and defensive scope handling

[mhdnazrul]

Type of Change

• Bug fix
• UI/UX improvement

Description

This Pull Request addresses two critical security and stability issues found in the search functionality of both the Install (Apps tabs) and Tweaks tabs.

1. Fix: Apps Search Wildcard Injection & Scope Handling

• Issue: Inputting special characters (e.g., [, *, {) triggered PowerShell wildcard errors, causing terminal crashes and UI freezes.
• Fix: Implemented literal string matching using .IndexOf() and handled the $sync object's scope more defensively to ensure it's always accessible.

2. Fix: Tweaks Search Hardening & PS 5.1 Compatibility

• Issue: The Tweaks search suffered from the same wildcard injection vulnerability. Additionally, certain modern PowerShell syntax (ternary operators) caused syntax errors on Windows PowerShell 5.1.
• Fix:
  • Replaced all -like operators with safe literal matching.
  • Standardized the code to be fully compatible with PowerShell 5.1 (removed ? : syntax).
  • Added robust null-checks for the tweaks panel and its child elements to prevent race condition crashes.
  • Improved UI logic for category labels (safe conversion of + to - prefixes).

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Visual Proof

A. Apps Tab (Install Tab)

Before (The Error):

After (The Fix):

B. Tweaks Tab

Before (The Error):

After (The Fix):

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Issue related to PR

• Resolves # None (Direct contribution)