fix: resolve remaining chat UI issues

[chryzxc]

Summary

• scope and dismiss live toast notifications by session
• prevent interactive prompts from leaking across sessions
• render the current transcript immediately at stream completion
• add regression coverage for the affected UI contracts

Validation

• npm run verify
• 1,829 tests passed, 0 failed

Closes #13
Closes #14
Closes #15
Closes #16

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: cc5cb001-f466-41ec-af0b-a2e1e6f5aec4

📥 Commits

Reviewing files that changed from the base of the PR and between e2f8b56 and 2fb9787.

📒 Files selected for processing (4)

• tests/regression/interactive-toast-and-terminal-handoff-regression.test.mjs
• webview/shared/src/chat/ChatShell.tsx
• webview/shared/src/chat/PanelComponents.tsx
• webview/shared/src/chat/ToastOverlay.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch agent/fix-issues-13-16

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