feat(ui): Build Task Execution Output Panel with Syntax Highlighting and Copy-to-Clipboard

[Godfrey-Delight]

Closes #239

Summary

Enhanced agent output panels (ResearchReportRenderer, CodingRenderer, DesignRenderer, and AgentOutputRenderer) with syntax highlighting, one-click copy-to-clipboard, auto-collapsible long sections, styled markdown tables with alternating row colors, external links opening in new tabs, metadata headers (agent name, execution time, token count), output content search filtering, and full-screen review mode.

Changes

• frontend/src/components/common/CopyButton.tsx: Created reusable copy-to-clipboard button component with 2-second checkmark visual feedback ("✓ Copied!").
• frontend/src/components/common/CollapsibleSection.tsx: Created reusable section container component that auto-collapses long content (> 500 characters) with character count badge and expand/collapse toggle.
• frontend/src/components/agents/ResearchReportRenderer.tsx: Enhanced ReactMarkdown rendering with react-syntax-highlighter (vscDarkPlus theme) and code copy buttons, markdown tables with alternating row colors, external links forced to open in a new tab (target="_blank"), and auto-collapsible sectioning for long reports.
• frontend/src/components/agents/CodingRenderer.tsx: Integrated line numbers, CopyButton, and output search query filtering.
• frontend/src/components/agents/AgentOutputRenderer.tsx: Added output header displaying agent name, execution time (ms/s), and token count, real-time search filter input, and full-screen review mode overlay.
• frontend/src/components/agents/DesignRenderer.tsx: Added searchQuery prop support for output filtering.
• frontend/src/components/agents/AgentOutputRenderer.test.tsx: Created unit tests covering copy feedback, auto-collapsible sections, syntax highlighting, search input filtering, and full-screen overlay mode.

Testing

• Unit Tests: Executed npm test (vitest run). All 13 test files and 123 tests passed.
• Type Checking & Production Build: Executed npm run build (tsc --noEmit && vite build). TypeScript compilation passed with 0 errors and production bundle generated cleanly.

Related Issue

• Branch: feat/output-panel-enhancement

Checklist

• Tests pass
• Lint is clean
• Documentation updated if needed

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