Close on focus loss behavior is now determined automatically

Fixes lint issues

Adds better rebase action display
Adds constraints to avoid invalid rebase

Renamed to Gutter Changes
Provides local changes if any, or recent commit changes
Distinguishes between added, changed, and removed lines
Shows a hover for the full diff hunk
Shows diff even with unsaved changes

Fixes age threshold schema

Increases default avatar size in hovers from 16 to 32px