Allow group members to record settlements on behalf of the payer

[Copilot]

Settlement recording was restricted to the payer in both UI (isOwnedByMe) and RLS (paid_by = auth.uid() behavior), which blocked legitimate member-driven settlement updates. This change allows any group member to record a settlement while preserving payer identity from the transaction (transaction.from).

• Database policy (Supabase migration)

  • Replaced Members can create settlements insert policy to authorize by group membership only.
  • New policy checks public.is_group_member(group_id) so recorder and payer can differ.

• Settle-up UI gating (GroupDetail.jsx)

  • Removed isOwnedByMe gating from the Paid action.
  • Removed isOwnedByMe gating from the confirm/cancel/amount row.
  • Kept isOwnedByMe for other existing UI copy/logic outside settlement action visibility.

• Recorder context UX

  • Added inline note during confirmation when recorder is not payer:
    • “Recording payment on behalf of {fromName}”

drop policy "Members can create settlements" on public.settlements;

create policy "Members can create settlements"
  on public.settlements for insert
  with check (public.is_group_member(group_id));

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