Fix receipt totals for mixed priced events

[decofe]

Summary

• use priced known-event amounts only when a receipt has any priced events
• preserve the existing raw total fallback when no event has pricing
• keep the currency prefix decision aligned with the priced-only total inputs
• add regression coverage for mixed priced/unpriced totals

Tests

• corepack pnpm --dir apps/explorer exec vitest run --config vitest.node.config.ts test/known-event-totals.node.test.ts
• corepack pnpm --dir apps/explorer exec biome check src/routes/_layout/receipt/$hash.tsx src/lib/domain/known-event-totals.ts test/known-event-totals.node.test.ts

Prompted by: @Slokh

[github-actions]

Bundle Size Report

Metric	Size	Δ Change
Total	5.1 MB	+844.4 KB (+19.5%)
Gzip	1.5 MB	+238.7 KB (+19.1%)
Brotli	1.3 MB	+209.0 KB (+19.2%)

Chunk changes (>1KB)

Chunk	Change
assets/chains.js (removed)	-360.7 KB
assets/export-rate-limit.js (removed)	-177.3 KB
assets/decodeAbiParameters.js (removed)	-71.7 KB
assets/AbiItem.js (removed)	-27.1 KB
assets/Bytes.js (removed)	-25.8 KB
assets/env.js	-9.5 KB
assets/validators.js (removed)	-5.1 KB
assets/wagmi.config.js	-4.4 KB
assets/readContracts.js (removed)	-2.7 KB
assets/_hash.js	+1.1 KB
assets/.js	+1.6 KB
assets/queryOptions.js	+1.9 KB
assets/tokenlist.js	+1.9 KB
assets/router.js	+2.0 KB
assets/_address.js	+2.0 KB
assets/known-event-totals.js (new)	+2.5 KB
assets/Address.js	+3.4 KB
assets/Errors.js (new)	+3.9 KB
assets/call.js	+4.2 KB
assets/sha3.js (new)	+5.2 KB
...and 12 more

Compared against main branch (baseline from 4/27/2026, 4:02:54 PM)

[github-actions]

Cloudflare Deployments

App	Environment	Status	Preview
explorer	devnet	[OK] Deployed	View Preview
explorer	mainnet	[OK] Deployed	View Preview
explorer	nextfork	[OK] Deployed	View Preview
explorer	testnet	[OK] Deployed	View Preview
fee-payer	devnet	[>>] Skipped	No changes
fee-payer	moderato	[>>] Skipped	No changes
fee-payer	privy	[>>] Skipped	No changes
og	-	[>>] Skipped	No changes
reth-snapshots-viewer	-	[>>] Skipped	No changes
tempo-snapshots-viewer	-	[>>] Skipped	No changes
tokenlist	-	[>>] Skipped	No changes