frontend: clear the 99 lint errors

`npm run lint` reported 99 errors and 26 warnings across 65 files and
had presumably been failing for a while — next.config.ts sets
eslint.ignoreDuringBuilds, so the build never surfaced it.

68 were in vendored code: components/charts and components/ai-elements,
pulled from upstream registries. Re-linting those reports upstream's
style back at us, and "fixing" them means diverging and eating conflicts
on every update — ai-elements already has exactly this carve-out on the
TypeScript side via ignoreBuildErrors. Ignore both, plus the two registry
files in components/ui (carousel publishes its api from an effect; the
sidebar skeleton picks a random width).

The other 31 were ours, nearly all react-hooks/set-state-in-effect on
the same shape: an effect that re-seeds form state when a dialog opens or
a selection changes. Moved to render-phase adjustment, which is both what
React recommends and a real fix — the effect version paints one frame of
the *previous* record's values before correcting itself. Two carried
sharper bugs: the employee dialog could keep a typed password across a
switch to another member, and use-wallet-sync could carry `linked` over
to a newly-selected patient, briefly offering to push a record to
someone else's wallet.

The rest: useIsMobile and speech-support detection become
useSyncExternalStore (correct on first paint, no mount flash); refs
mirroring state are written in effects rather than during render; the
care-team fetch moves into its effect behind a reload key, dropping an
exhaustive-deps suppression.

Two effects in chat-panel keep the rule disabled with a reason. Both are
what effects are for: draining the queued-message buffer when the
transport goes idle, and resolving ?thread from the URL — the latter
mints an id with nanoid(), so moving it into render would just trade this
error for a purity one.

Also removes a dead /explore-era import and unused directives found on
the way. lint now exits 0, with the ai-elements tsc carve-out unchanged.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/components/ui/timeline.tsx

@@ -125,7 +125,10 @@ interface TimelineIndicatorProps extends React.HTMLAttributes<HTMLDivElement> {
 }
 
 function TimelineIndicator({
-  asChild = false,
+  // Accepted for API parity but unused: COSS/Base UI composes with `render`,
+  // not `asChild`. Destructured so it never lands on the DOM node.
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  asChild: _asChild = false,
   className,
   children,
   ...props