chore: upgrade TypeScript 4.9 to 5.9, ESLint 8.29 to 8.57, @typescript-eslint 5 to 7

Resolves all TS2345/TS2347/TS7006 type errors introduced by stricter TypeScript 5.x.
Fix Icons.Settings to Icons.Setting, cast account data returns, fix implicit any.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/features/settings/notifications/KeywordMessages.tsx

@@ -192,7 +192,7 @@ export function KeywordMessagesNotifications() {
           <KeywordInput />
         </SettingTile>
       </SequenceCard>
-      {keywordPushRules.map((pushRule) => (
+      {keywordPushRules.map((pushRule: any) => (
         <SequenceCard
           key={pushRule.rule_id}
           className={SequenceCardStyle}