In-place editing could use the tab model's step and focus, lose its active
state after switching tabs, or resolve a nested instance through the wrong
parent. Entering before the final animation key also moved geometry when
drilling into a child.
Use the edited model for step controls, step edits, visibility, and focus
coordinates. Restore that editing target when returning to its tab, include
animation keys and finite hide steps in the last step, and retain the
selected instance path and transforms during nested editing.
Show the editing path only during in-place edits, with links to ancestors
and a close control to return to the tab model. Stack Find/Replace beneath
it and preserve full names in accessible text and tooltips. Add translated
source entries without changing existing translations.
Add a regression test for final-key tracking through time and key edits.
Validated with the macOS Qt 6 application build, all 8 Qt Test cases, and
51 focused checks against the compiled application for steps, tab switching,
focus status, breadcrumbs, and Find/Replace layout. Visually checked the
viewport overlay and its placement during nested editing.
