Sync private Space from hfviewer-719a11371473

Sync Space from hfviewer-22514889f757

Sync private Space from hfviewer-c4dcc5b3bf69

Sync private Space from hfviewer-3ced0785700d

Use compact Space controls across viewer modes

Carry Space login into website account links

Add compact Space account control

Fix account menu destinations

Remove Hugging Face profile from account menu

Expose logged-in hfviewer features in account menu

Prepare login immediately after Space logout

Allow retrying an interrupted Space login

Fix private Space OAuth handoff

Use native navigation for OAuth popup

Fix sandboxed OAuth popup bootstrap

Fix partition-safe native HF login handoff

Harden Space analytics attribution and privacy

Restore Space styling and add native Hugging Face login