Update proposal detail activity timeline to log owner-weight-change events (#397)

[ByteForce-Labs]

Summary

Closes #397

When an owner's voting weight changes, that event is now logged in the proposal detail page's activity timeline, interleaved in correct chronological order with existing approve, revoke, and execute events.

Changes

• frontend/src/lib/contract.ts — getProposalEvents now includes governance-wide owner_weight_changed (c_wgt) events in every proposal's chronological history, and each weight-change entry names the affected owner with its old → new weight (e.g. GOWNER...AAAA: Weight: 25 → 40).
• frontend/src/pages/ProposalDetailPage.tsx — activity timeline renders owner-weight-change entries with a clear "Owner Weight Changed" badge.
• frontend/src/lib/__tests__/contract-events.test.ts — updated to assert the owner-named weight-change detail.
• frontend/src/pages/ProposalDetailPage.test.tsx — added timeline rendering test for owner-weight-change events alongside approve/execute.
• Supporting contract-lib refactors (duplicate helper dedup, getOwnerWeight returns bigint, recurring-proposal wrapper cleanup) and OwnersPage quorum/weight UI additions.

Acceptance criteria

• ✅ Activity timeline displays owner-weight-change events alongside approve, revoke, and execute events.
• ✅ Weight-change entries appear in the correct chronological position.
• ✅ Each weight-change entry names the affected owner and shows old and new weight.
• ✅ Proposals with no weight-change events look unchanged.

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[thegreatfeez]

Resolve the conflict