- Drop dead overrideTitle/clearTitleOverride wrappers; setCustomTitle is the only writer. - Bump snapshot schema to v2 and migrate v1 title -> customTitle on decode so previously frozen titles survive the upgrade as user overrides instead of getting overwritten by the next OSC-2 update. - Auto select-all when entering inline rename so users can immediately overwrite. - Frame the rename TextField with a bordered field to make edit mode visually obvious. - Remove redundant onDisappear rename-save path; tabs.didSet already drives the editing teardown.