chore: move biome config to biome.jsonc and baseline existing violations

biome.json is strict JSON; the jsonc extension allows the annotations
on the baseline entries. Rules that currently fail are downgraded to
warn with a note against issue #421 — restore each to error as its
occurrences are fixed. files.experimentalScannerIgnores keeps the
scanner out of .worktrees/ so a local worktree's own config can't
conflict with the root one.

Also fixes the handful of auto-fixable errors (unused imports in docs/
and landing/, @ts-expect-error over @ts-ignore). bun run lint is now
green: 0 errors, 96 warnings visible as debt.

landing/src/lib/token-stats.ts

@@ -9,7 +9,6 @@
 //     for price — nothing is asserted that can't be verified on Solscan.
 
 import {
-  TOKEN_BURN_ADDRESS,
   TOKEN_CONTRACT_ADDRESS,
   TOKEN_CREATOR_ADDRESS,
   TOKEN_DEV_WALLETS,