Document Security Center customer impact dashboard

[osc135]

Summary

• Updates the existing Vendor Portal Security Center dashboard screenshot.
• Adds a screenshot and documentation for the Customer Impact dashboard.
• Documents the Overview and By Customer views based on vandoor origin/main, including fixable CVE defaults and air gap instance behavior.

Test plan

• Compared the documented UI and behavior with vandoor origin/main at 11012862b.
• Ran git diff --check.
• Verified both image files match the paths referenced by the documentation.
• Review the Netlify deploy preview for image rendering and page layout.

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[AmberAlston]

Approving — this is accurate for the Security Center as it ships today, where release impact is the default view and Customer Impact is the secondary section you switch into.

One flag for a follow-up. We haven't yet implemented the nav design intent in sc-136182, which inverts this so Customer Impact becomes the default landing and release impact moves to secondary. When that lands, this page will need another pass to reorder the content to lead with Customer Impact and to match the updated nav guidance. The "go to Security and select Customer Impact" wording and the screenshots will both change.

Good to merge now, just noting it'll need revisiting once 136182 restructures the nav.