feat: bump eslint & oxlint (#14452)

#### PR Dependency Tree


* **PR #14452** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Bug Fixes**
* Improved null-safety, dependency tracking, upload validation, and
error logging for more reliable uploads, clipboard, calendar linking,
telemetry, PDF/theme printing, and preview/zoom behavior.
* Tightened handling of all-day calendar events (missing date now
reported).

* **Deprecations**
  * Removed deprecated RadioButton and RadioButtonGroup; use RadioGroup.

* **Chores**
* Unified and upgraded linting/config, reorganized imports, and
standardized binary handling for more consistent builds and tooling.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/track/src/__tests__/tracker.spec.ts

@@ -79,6 +79,6 @@ describe('tracker session signals', () => {
     const sessionStart = events.find(
       event => event.eventName === 'session_start'
     );
-    expect((sessionStart?.params as any).session_number).toBe(2);
+    expect(sessionStart?.params?.session_number).toBe(2);
   });
 });

packages/frontend/track/src/auto.ts

@@ -116,6 +116,7 @@ export function enableAutoTrack(root: HTMLElement, trackFn: TrackFn) {
 declare module 'react' {
   //  we have to declare `T` but it's actually not used
 
+  // oxlint-disable-next-line no-unused-vars
   interface HTMLAttributes<T> {
     'data-event-props'?: EventsUnion;
     'data-event-arg'?: string;

packages/frontend/track/src/telemetry.ts

@@ -94,8 +94,8 @@ export function setTelemetryContext(
   const nextUserProps = options.replaceUserProperties
     ? (update.userProperties ?? {})
     : {
-        ...(context.userProperties ?? {}),
-        ...(update.userProperties ?? {}),
+        ...context.userProperties,
+        ...update.userProperties,
       };
 
   context = {

packages/frontend/track/src/tracker.ts

@@ -241,7 +241,7 @@ function mergeSessionParams(
   engagementMs: number
 ) {
   const merged: Record<string, unknown> = {
-    ...(params ?? {}),
+    ...params,
   };
   if (Number.isFinite(nextSessionId) && nextSessionId > 0) {
     merged.session_id = nextSessionId;