Linutil Debloat

[Abs313a]

Type of Change

• New feature
• Bug fix
• Documentation update
• Refactoring
• Hotfix
• Security patch
• UI/UX improvement

Summary

This PR performs a focused debloat pass across Linutil shell scripts and related TUI behavior, reducing duplicated code while preserving functionality and UX.

What Changed

1) Mechanical shell cleanup (P1)

• Removed redundant checkEscalationTool calls where checkEnv already sets escalation.
• Removed duplicate common-script.sh sourcing in monitor-control scripts that already source shared utilities.
• Normalized mismatched menu prompt ranges where applicable.

2) Monitor-control cleanup (P2)

• Removed duplicate local confirm_action implementation and reused shared helper.
• Simplified set_resolutions.sh indexing/temp-file flow while preserving behavior.

3) Shared install/uninstall menu abstraction (P3)

• Added shared helper in core/tabs/common-script.sh:
  • run_install_uninstall_menu
• Migrated repetitive 2-option install/uninstall main() menus across emulator and design-tool scripts to the shared helper.
• Left retroarch.sh unchanged because it uses a custom multi-option flow.

4) Abort UX improvement

• Added (Abort) to shared install/uninstall menu.
• Abort now exits with code 130 (instead of success 0).
• TUI now auto-closes command window on abort exit code and returns directly to list view, avoiding misleading success styling.

5) Docs update

• Updated README.md to document shared script menu behavior (Install, Uninstall, Abort).

Impact

• Significant reduction of duplicated shell boilerplate across scripts.
• Cleaner shared behavior for menu handling.
• Better UX for cancel/abort path.
• No intended functional regressions in install/uninstall logic.

Issues / other PRs related

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Screenshots (if applicable)

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[Abs313a]

@ChrisTitusTech pre-review glance..