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/backend/server/src/base/helpers/crypto.ts

@@ -51,10 +51,10 @@ function parseKey(privateKey: string) {
   let priv: KeyObject;
   try {
     priv = createPrivateKey({ key: keyBuf, format: 'pem', type: 'pkcs8' });
-  } catch (e1) {
+  } catch {
     try {
       priv = createPrivateKey({ key: keyBuf, format: 'pem', type: 'sec1' });
-    } catch (e2) {
+    } catch {
       // As a last resort rely on auto-detection
       priv = createPrivateKey(keyBuf);
     }

packages/backend/server/src/base/utils/request-tracker.ts

@@ -22,12 +22,14 @@ function firstNonEmpty(...values: Array<string | undefined>) {
 }
 
 export function getRequestClientIp(req: Request) {
-  return firstNonEmpty(
-    req.get('CF-Connecting-IP'),
-    firstForwardedForIp(req.get('X-Forwarded-For')),
-    req.get('X-Real-IP'),
-    req.ip
-  )!;
+  return (
+    firstNonEmpty(
+      req.get('CF-Connecting-IP'),
+      firstForwardedForIp(req.get('X-Forwarded-For')),
+      req.get('X-Real-IP'),
+      req.ip
+    ) ?? ''
+  );
 }
 
 export function getRequestTrackerId(req: Request) {
@@ -39,6 +41,7 @@ export function getRequestTrackerId(req: Request) {
       req.get('X-Real-IP'),
       req.get('CF-Ray'),
       req.ip
-    )!
+    ) ??
+    ''
   );
 }

packages/backend/server/src/base/utils/ssrf.ts

@@ -180,7 +180,7 @@ export async function assertSsrFSafeUrl(
   let addresses: string[];
   try {
     addresses = await resolveHostAddresses(hostname);
-  } catch (error) {
+  } catch {
     throw createSsrfBlockedError('unresolvable_hostname', {
       url: url.toString(),
       hostname,