fix(process-list): defer IPC actions until modal is loaded

[AiraNadih]

Description

Defers process-list IPC actions until the lazy-loaded modal is available. Previously, IPC could report success without opening the modal.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that changes existing behavior)
• Refactor / internal cleanup
• Documentation
• Other

Related issues

Screenshots / video

Not applicable; no visual changes.

Checklist

• My code follows the conventions in CONTRIBUTING.md
• I have tested my changes locally
• New user-facing strings are wrapped in I18n.tr() with translator context, reusing existing terms where possible (no new strings)
• Go changes: ran make fmt, added/updated tests, make test passes, and go mod tidy is clean (not applicable)
• QML changes: ran make lint-qml with no new warnings
• I have opened a corresponding pull request in dlx-docs to document any new behaviors (not applicable; no new behavior)