blog(autorouter): use an opaque dashboard screenshot so it reads in dark mode

[devin-ai-integration]

Summary

The Auto-Router Usage screenshot in the spend-visibility post (#792) was exported with a transparent background, so in dark mode the page background showed through and the dark chart text became unreadable. Replaces it with an opaque export.

auto-router-usage-tab.png
- 2176x1806 RGBA, alpha extrema (0, 255), corner pixel (0,0,0,0)
+ 2176x1934 RGBA, alpha extrema (255, 255), corner pixel (255,255,255,255)

Image-only change; no prose or frontmatter touched. The new capture is also slightly taller because it includes the full prompt-caching table.

Link to Devin session: https://app.devin.ai/sessions/3fdcba0d96fb4f9ea1bfcf18f39230e6

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Project	Deployment	Actions	Updated (UTC)
litellm	Ready	Preview	Aug 6, 2026 4:10am

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.