site: add static PNG preview for external tool directories

[somework]

Adds docs/preview.png — a static terminal frame (clone → status → clean) extracted from the demo GIF. Terminal Trove and similar CLI directories require a hosted PNG preview URL; this self-hosts one on Pages next to the existing demo.gif. No code change.

[coderabbitai]

Important

Review skipped

Review was skipped due to path filters

⛔ Files ignored due to path filters (1)

• docs/preview.png is excluded by !**/*.png

CodeRabbit blocks several paths by default. You can override this behavior by explicitly including those paths in the path filters. For example, including **/dist/** will override the default block on the dist directory, by removing the pattern from both the lists.

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Review profile: CHILL

Plan: Pro Plus

Run ID: baf7769e-2126-4d37-af27-cff742fab6e0

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch site/terminaltrove-preview

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