fix(ui): remove inset border framing the integrated terminal

[jonathanKingston]

Summary

• Remove the top border on .terminals-viewer-host that stacked with the tree resizer and read as an L-shaped inset frame around the terminal column.
• Remove padding on .terminal-container so the xterm surface sits flush with the viewer instead of showing a gutter around the dark terminal background.
• Add a computed-style assertion in terminal-display.e2e.ts to guard against regressions.

Test plan

• npx prettier --check on changed files
• npm run build && npm run test:e2e -- --spec tests/e2e/terminal-display.e2e.ts (updates terminal-shell-prompt.png / terminal-echo-hello.png if layout changed)
• Visually confirm Terminal tab: no inset box around xterm; sidebar resizer remains the only vertical seam

Made with Cursor

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(requestId: serverGenReqId_86e40e52-e621-4e5a-8b99-8773edc7f8bd)

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Not approving: Cursor Bugbot skipped (usage limit reached) and did not complete automated review. Requested AutomatedTester for manual review of this terminal layout CSS fix.

  

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