feat(explorer): show homepage usage metrics

[decofe]

Refs SYM-3

Summary

• add server-side explorer homepage metrics for all-time and last-24h transactions, contract deployments, and token launches
• render a new Network Snapshot section on the landing page below the search input
• add query-helper coverage for the new aggregate counts
• include repo-wide biome formatting fixes required by the mandated root pnpm check run

Validation

• pnpm --filter explorer test
• pnpm check
• pnpm check:types
• pnpm precommit

Screenshots

Before	After
Landing page only showed the animated intro and search input.	Landing page now shows a Network Snapshot metrics strip under the search input with all-time totals and 24h activity.

[github-actions]

Bundle Size Report

Metric	Size	Δ Change
Total	5.1 MB	+299.4 KB (+6.1%)
Gzip	1.4 MB	+146.4 KB (+11.0%)
Brotli	1.2 MB	+122.4 KB (+10.6%)

Chunk changes (>1KB)

Chunk	Change
assets/KeyManager.js (removed)	-477.4 KB
assets/QueryBuilder.js (removed)	-423.4 KB
assets/Intro.js (removed)	-66.0 KB
assets/createSsrRpc.js	-43.3 KB
assets/Hash.js (removed)	-31.0 KB
assets/stringify.js (removed)	-19.7 KB
assets/isAddressEqual.js	-18.4 KB
assets/_layout.js	-16.0 KB
assets/address.js	-14.1 KB
assets/Address.js	-13.1 KB
assets/base.js (removed)	-12.8 KB
assets/getAction.js	-12.7 KB
assets/createServerFn.js (removed)	-12.2 KB
assets/token.server.js (removed)	-9.8 KB
assets/tx.js	-9.7 KB
assets/utils.js	-7.6 KB
assets/validators.js (removed)	-5.9 KB
assets/sha3.js (removed)	-5.5 KB
assets/TxEventDescription.js	-3.1 KB
assets/useWatchBlockNumber.js (removed)	-2.1 KB
...and 30 more

Compared against main branch (baseline from 2/4/2026, 5:13:51 PM)

[github-actions]

Cloudflare Deployments

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