feat: add new event types and messages for fee collection and configuration updates

[fadesany]

closes #657

[ogazboiz]

good direction adding handlers for the new event types. couple of cleanups before merge:

1. ActivityHistory.tsx:84 — the metadata const in the FEE_COLLECTED case is parsed but never read. drop it (the case only uses amount and event.streamId), or use the parsed metadata to show the fee amount from metadata.fee_amount if that's what the indexer emits.

2. ActivityHistory.tsx:106 — ADMIN_TRANSFERRED reads as "Admin transferred" with no context. if the indexer puts the new admin in metadata, surface it: Admin transferred to {metadata.new_admin}. otherwise add a TODO comment so the next person knows the data is missing.

3. rebase on main once you're back. #732 merged and turned on noUnusedLocals in the frontend tsconfig, so the unused metadata const above will start failing typecheck once you pull.

git fetch upstream
git rebase upstream/main
git push --force-with-lease

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[ogazboiz]

thanks, both items addressed cleanly. CI hasn't triggered on the new commit yet — push an empty commit (git commit --allow-empty -m 'trigger ci') or close/reopen the PR to retrigger, then ping back when green and i'll merge.

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[ogazboiz]

actually disregard that — i approved the pending workflow runs (CI needed maintainer approval since you're a first-time contributor). they're running now. once green i'll merge.

[fadesany]

all ci passed