* fix(mobile): preserve agent icons across stacked routes and tab updates
Closes#31939
* fix(renderer): address review feedback on mobile agent icon stability
* fix(renderer): fall back to customTitle when saved leafTitle is blank
* Keep mobile agent icons painted across retained routes
Use instance-specific OMP gradients and preserve bundled icon fallback during web image reload failures. Add a real mobile-web route-retention pixel regression.
Adapted from zhangxaochen’s scoped rendering fixes in #31948; unproven session equality and title changes are excluded.
Co-authored-by: zhangxaochen <zhangxaochen@163.com>
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Co-authored-by: Neil <neil@stably.ai>
zhangxaochenandNeil
c91a40c43d