feat: land on most recently used project

[adaam2]

Summary

• When returning to the app at the root URL (/), redirect to the user's last-visited project instead of the org home page
• Uses the existing preferredProject localStorage key that was already being written on every project visit
• Also uses the preferred project as the default fallback in ProjectProvider (instead of always picking projects[0])
• Validates the stored slug against the user's current project list, falling back gracefully if the project no longer exists

Closes AGE-1582

Test plan

• Open the app, visit a specific project (e.g. "my-project")
• Navigate away or close the tab, then reopen the app at the root URL /
• Verify you land on "my-project" instead of the org home
• Delete the preferredProject key from localStorage, reload at / — should fall back to org home
• Visit /:orgSlug directly — should still show the org home page (no forced redirect)
• Switch orgs — verify the preferred project is validated against the new org's project list

🤖 Generated with Claude Code

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[linear]

AGE-1582 feat: land on most recently used project

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Project	Deployment	Actions	Updated (UTC)
gram-docs-redirect	Ready	Preview, Comment	Mar 13, 2026 5:37pm

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