Support multi line terminal command approvals with ellipsis and aligned approve button

[benibenj]

Copilot Generated Description: Implement support for multi-line terminal command approvals, allowing up to three lines to be displayed with an ellipsis for overflow. Adjust the approval row height dynamically based on the number of lines. Update CSS for alignment and styling of the approval button. Add new test fixtures for various approval scenarios.

[Copilot]

Pull request overview

Adds support for displaying multi-line terminal command approval labels (up to 3 lines with ellipsis) and adjusts list row heights + styling so the approve button aligns with the truncated label content.

Changes:

• Compute dynamic approval-row height based on the number of command lines (capped at 3).
• Render approval labels as multiple single-line code blocks with ellipsis + full hover content.
• Add new component fixtures for 1–4 lines and long multi-line approval labels; tweak CSS alignment.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
src/vs/workbench/test/browser/componentFixtures/agentSessionsViewer.fixture.ts	Adds fixtures covering 1–4 line and long multi-line approval label scenarios.
src/vs/workbench/contrib/chat/browser/agentSessions/media/agentsessionsviewer.css	Updates approval-row alignment and removes fixed height to allow dynamic sizing.
src/vs/workbench/contrib/chat/browser/agentSessions/agentSessionsViewer.ts	Implements multi-line truncation + hover and computes dynamic row height for list virtualization.

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