Fix mobile preview navigation and add app visual

[promisepreston]

Summary

• make preview navigation a responsive four-tab control on narrow screens
• version the stylesheet URL so new markup cannot reuse stale cached CSS
• add a privacy-safe RecordCove product visual using synthetic sample content
• document and test the public screenshot privacy boundary

Verification

• npm test (14/14)
• npm run build
• xmllint --noout site/assets/recordcove-app-preview.svg
• git diff --check
• Codex browser at 390x844: no horizontal overflow; all four links fit; product visual loads
• Codex browser at 1440x900: no horizontal overflow; product visual loads

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 53e6d909-cb0e-4472-8609-7093166db0df

📥 Commits

Reviewing files that changed from the base of the PR and between 9225546 and 76ac912.

⛔ Files ignored due to path filters (1)

• site/assets/recordcove-app-preview.svg is excluded by !**/*.svg

📒 Files selected for processing (7)

• README.md
• site/downloads.html
• site/index.html
• site/install.html
• site/styles.css
• site/testing.html
• test/site.test.mjs

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud