72939 Complete migration to null safety in api documentation (a: null-safety, cla: yes, f: cupertino, f: material design, framework, team)

72944 [gen_l10n] Improve status message when untranslated messages are still present (a: internationalization, cla: yes, tool, waiting for tree to go green)

72945 Add widget of the week videos (cla: yes, f: material design, framework, waiting for tree to go green)

72946 Handle infinite/NaN rects in Hero flights. Less exclamation marks. (cla: yes, framework, waiting for tree to go green)

72950 [gen_l10n] Use l10n.yaml file instead of command line arguments if it exists (cla: yes, tool)