fix(library): fix Popover initialization in LibrarySearchFilter causing page load failure

Commit notes

The LibrarySearchFilter component was using an incorrect Popover initialization pattern that caused the library page not to load:

1. Variable declaration order issue: filterOpen variable was declared AFTER being referenced in the Popover constructor (temporal dead zone issue)

2. Wrong Popover pattern: The component used custom open/onOpenChange callbacks and getter functions for floatingConfig, which differs from the simple pattern used in all other working components

Fixed by: - Removing the custom open/onOpenChange callbacks from Popover constructor - Using floatingConfig as a plain object instead of a getter function - Using filterPopover.open directly instead of separate filterOpen state - Matching the pattern used in WorkspaceSwitcher, Header, and other components

Co-authored-by: armin.naimi <[email redacted]>