Attempted fix for private PDF 403 error

[allanlasser]

Fixes #836

When we're fetching a private asset and we get a 403 response, try refetching the private asset URL and trying again (up to a maximum of 5 tries).

[netlify]

✅ Deploy Preview for documentcloud-frontend-next ready!

Name	Link
🔨 Latest commit	41ebce7
🔍 Latest deploy log	https://app.netlify.com/sites/documentcloud-frontend-next/deploys/675b62a81f66b8000738ba90
😎 Deploy Preview	https://deploy-preview-974.muckcloud.com
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 27 (🔴 down 22 from production) Accessibility: 87 (🟢 up 1 from production) Best Practices: 83 (🔴 down 9 from production) SEO: 83 (no change from production) PWA: - View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	31.7%	7638 / 24093
🔵	Statements	31.7%	7638 / 24093
🔵	Functions	47.74%	338 / 708
🔵	Branches	75.73%	1108 / 1463

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
src/lib/components/viewer/ViewerContext.svelte	0%	0%	0%	0%	1-216

Generated in workflow #511 for commit 41ebce7 by the Vitest Coverage Report Action