build: bump floret-kit to 0.5.0 for the optional back affordance
The four tabs are navigation destinations, not pushed detail screens, so they pass no `onBack`. Without this pointer bump a fresh clone resolves the kit at 0.4.0, where `onBack` is required, and CI fails at configuration time while a dirty local submodule builds fine. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Wmy1BpCKi8KeSjaWhYuCPV
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