fix - nested scrolling and full-row table selection for auto-approve preferences

[xinyi-gong]

Summary

• Forward vertical mouse wheel events from auto-approve inner viewers to the parent preference scroller only after the inner viewer reaches its scroll boundary
• Update auto-approve tables so the last column fills remaining table width, matching the custom instructions table behavior

[Copilot]

Pull request overview

This PR improves the Auto-Approve preferences UI by making nested viewers scroll naturally inside a parent preference scroller, and by ensuring the “last” table column expands to fill remaining width (matching the existing Custom Instructions table behavior).

Changes:

• Added a shared SWT utility to forward vertical mouse-wheel events to a parent ScrolledComposite when the nested viewer is at its scroll boundary.
• Enabled vertical scrolling on the auto-approve Table/Tree viewers and applied the wheel-forwarding behavior.
• Updated the auto-approve tables to resize the last column to fill remaining width on control resize.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/utils/SwtUtils.java	Adds a helper to forward mouse-wheel scrolling from nested scrollables to a parent scroller at boundaries.
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/preferences/TerminalAutoApproveSection.java	Enables V_SCROLL, forwards wheel at boundaries, and makes the status column fill remaining table width.
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/preferences/McpAutoApproveSection.java	Enables V_SCROLL on the tree and forwards wheel at boundaries for better nested scrolling behavior.
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/preferences/FileOperationAutoApproveSection.java	Enables V_SCROLL, forwards wheel at boundaries, and makes the status column fill remaining table width.