Add shareable URLs for model popouts

[MaanavD]

Summary

Add direct shareable URLs for model details popouts on the models page.

Changes

• drive model popout state from the model query param on /models
• restore the prior models page URL when closing a popout opened from filtered results
• clear invalid model aliases with a toast and remove the bad query param
• add a canonical Copy Share Link action for the model details modal
• reserve header space so the share action does not crowd the modal close button

Validation

• tested locally in the running dev server
• verified editor diagnostics reported no errors in the touched files

[vercel]

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Project	Deployment	Actions	Updated (UTC)
foundry-local	Ready	Preview, Comment	Mar 6, 2026 7:58pm