Unsaved changes warning shown for documents with white space in the title

[thebiglabasky]

Describe the bug
metaboat.slack.com/archives/C0641E4PB9B/p1759750615270679

To Reproduce
Create a document with a whitespace at the end of its title
Save it
Try to close tab
❌ unsaved changes warning is shown

Information about your Metabase installation
master, metabase/metabase@573b3c6

Severity
P3

Proposed fix
Either (or both):

do not use trim() when comparing changes
trim whitespace from document title on save