feat(files): fullscreen preview, relative markdown links, and preinstalled Chromium

[chriswritescode-dev]

Problem

Three commits were pushed to fix/file-browser-paths-and-preview after #367 had already been squash-merged, so they never reached main: the fullscreen file preview, relative markdown link handling, and the Chromium preinstall in the Docker image.

Changes

• Add a fullscreen file preview with a minimal close control.
• Open relative markdown links from rendered markdown in the file browser and in chat messages, through a shared markdownLinks helper and MarkdownLink component.
• Preinstall the pinned Playwright Chromium binary and its system dependencies into a shared browsers path in the Docker image.
• Update the Docker config test to cover the new Chromium install step.

Testing

• Frontend: 1744 tests passed; tsc clean.
• Backend: 2475 tests passed; tsc clean.
• pnpm lint -> 0 errors (pre-existing no-explicit-any warnings only).

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📥 Commits

Reviewing files that changed from the base of the PR and between 304f636 and d328423.

📒 Files selected for processing (16)

• Dockerfile
• backend/src/constants.ts
• backend/test/scripts/docker-config.test.ts
• docs/configuration/docker.md
• docs/features/sandboxing.md
• frontend/src/components/file-browser/FileBrowser.tsx
• frontend/src/components/file-browser/FilePreview.test.tsx
• frontend/src/components/file-browser/FilePreview.tsx
• frontend/src/components/file-browser/MarkdownRenderer.tsx
• frontend/src/components/file-browser/MobileFilePreviewModal.tsx
• frontend/src/components/message/MessagePart.test.tsx
• frontend/src/components/message/MessagePart.tsx
• frontend/src/components/message/TextPart.tsx
• frontend/src/components/ui/markdown-link.tsx
• frontend/src/lib/markdownLinks.test.ts
• frontend/src/lib/markdownLinks.ts

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