Redesign Amounts section with Composition Basis dropdown and phase su…

[shubham148-st]

This PR redesigns the Amounts section within the MaterialStream Results tab to significantly improve usability and data scannability. It replaces the old, deeply nested layout with a clean, top-level tab split, a dedicated Composition Basis dropdown, and specialized phase sub-tabs.

Key Changes

1. Tab Layout Restructuring

• Replaced the single QToolBox with two distinct, top-level tabs: Amounts and Phase Properties.
• Added a Composition Basis dropdown at the top, allowing users to toggle between Mole Fraction, Mass Fraction, Mole Flow, and Mass Flow.
  • Positioned Mixture, Liquid, and Vapour sub-tabs directly below the dropdown. Each sub-tab now displays a clean view of the chemical compounds alongside their respective values strictly for the selected basis.
• Phase Properties Maintenance: The Phase Properties tab completely retains its existing Mixture / Liquid / Vapour accordion layout, ensuring backward compatibility.

2. UI Codebase Cleanup

• Widget Migration (DockWidgetMaterialStream.ui): Replaced the legacy QToolBox layout in the UI designer file with the updated tabbed configuration.
• Data Mapping Refactor (DockWidgetMaterialStream.py): Updated the widget setup routines and results population pipeline. Added dynamic switching logic to re-populate compound tables instantly when the selected composition basis changes.
• Deduplication: Safely eliminated all stale references to deleted tree widgets (mTreeWidget, lTreeWidget, vTreeWidget).
  ameters normally.