Ignore a few linting errors

Author: sandhose

biome.json

@@ -1,5 +1,5 @@
 {
-  "$schema": "https://biomejs.dev/schemas/2.0.6/schema.json",
+  "$schema": "https://biomejs.dev/schemas/2.2.4/schema.json",
   "assist": { "actions": { "source": { "organizeImports": "on" } } },
   "vcs": {
     "enabled": true,
@@ -32,6 +32,12 @@
     "enabled": true,
     "rules": {
       "recommended": true,
+      "complexity": {
+        "noImportantStyles": "off"
+      },
+      "suspicious": {
+        "noUnknownAtRules": "off"
+      },
       "correctness": {
         "noUnusedImports": "warn",
         "noUnusedVariables": "warn"

frontend/src/components/Separator/Separator.tsx

@@ -5,6 +5,7 @@
 
 // biome-ignore-all lint/a11y/useFocusableInteractive: this is a false positive
 // biome-ignore-all lint/a11y/useAriaPropsForRole: this is a false positive
+// biome-ignore-all lint/a11y/useSemanticElements: I don't want to use an <hr />
 
 import cx from "classnames";
 import { forwardRef } from "react";

frontend/src/routes/_account.sessions.index.tsx

@@ -179,7 +179,7 @@ function Sessions(): React.ReactElement {
               <CompatSession key={session.cursor} session={session.node} />
             );
           default:
-            unknownSessionType(type);
+            return unknownSessionType(type);
         }
       })}