fix(fresh-ui): registry ChartBlock + Toast fail deno lint/check when copied into a Deno app

[rickylabs]

Summary

Two @netscript/fresh-ui registry components ship source that fails deno lint / deno check the moment they're copied into a standard Deno Fresh app via ui:add / ui:init (alpha.18). Both block deno task check immediately, so every consumer must hand-patch copy-source files (which then get clobbered on the next ui:init --force). Fixing upstream makes them permanent.

Repro: netscript ui:init --force + netscript ui:add ai into a Deno app, then deno lint . && deno check.

1 · registry/components/ui/chart-block.tsx — jsx-key (3 unkeyed list renders, column variant)

error[jsx-key]: Missing 'key' prop for an element
  chart-block.tsx:70  {ticks.map((tick) => <span class='ns-colchart__ytick'>…)}
  chart-block.tsx:73  {data.map((datum) => <div class='ns-colchart__col'>…)}
  chart-block.tsx:87  {data.map((datum) => <span>{datum.label}</span>)}

Fix: add key (index is fine) to each mapped element, e.g. data.map((datum, i) => <span key={i}>….

2 · registry/islands/ui/toast.tsx (Toast) — setTimeout ref type (TS2322)

TS2322: Type 'Timeout' is not assignable to type 'number'.
  toast.tsx  exitTimeoutRef.current = globalThis.setTimeout(…)   (useRef<number>())

Under Deno with Node types in scope, globalThis.setTimeout returns Timeout, not number. The three timeout refs are declared useRef<number>().
Fix: useRef<ReturnType<typeof setTimeout>>() for exitTimeoutRef / hideTimeoutRef / urlCleanupTimeoutRef (leave the two genuine numeric refs).

Context

Found while adopting fresh-ui@0.0.1-alpha.18 in eis-chat (rickylabs/eis-chat#28/#29). Patched locally as copy-source for now; filing so the registry source is fixed permanently. Both are trivial, mechanical fixes.