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/developer-tools/DevelopTools.tsx

@@ -25,7 +25,7 @@ export function DeveloperTools({ requestClose }: DeveloperToolsProps) {
 
   const submitAccountData: AccountDataSubmitCallback = useCallback(
     async (type, content) => {
-      await mx.setAccountData(type, content);
+      await (mx as any).setAccountData(type, content);
     },
     [mx],
   );
@@ -34,7 +34,9 @@ export function DeveloperTools({ requestClose }: DeveloperToolsProps) {
     return (
       <AccountDataEditor
         type={accountDataType ?? undefined}
-        content={accountDataType ? mx.getAccountData(accountDataType)?.getContent() : undefined}
+        content={
+          accountDataType ? (mx as any).getAccountData(accountDataType)?.getContent() : undefined
+        }
         submitChange={submitAccountData}
         requestClose={() => setAccountDataType(undefined)}
       />

src/app/features/settings/emojis-stickers/GlobalPacks.tsx

@@ -1,3 +1,4 @@
+import { MatrixEvent } from 'matrix-js-sdk';
 import React, { MouseEventHandler, useCallback, useEffect, useMemo, useState } from 'react';
 import {
   Box,
@@ -303,7 +304,9 @@ export function GlobalPacks({ onViewPack }: GlobalPacksProps) {
   const [applyState, applyChanges] = useAsyncCallback(
     useCallback(async () => {
       const content =
-        mx.getAccountData(AccountDataEvent.PoniesEmoteRooms)?.getContent<EmoteRoomsContent>() ?? {};
+        (
+          (mx as any).getAccountData(AccountDataEvent.PoniesEmoteRooms) as MatrixEvent | undefined
+        )?.getContent<EmoteRoomsContent>() ?? {};
       const updatedContent: EmoteRoomsContent = JSON.parse(JSON.stringify(content));
 
       selectedPacks.forEach((addr) => {
@@ -320,7 +323,7 @@ export function GlobalPacks({ onViewPack }: GlobalPacksProps) {
         }
       });
 
-      await mx.setAccountData(AccountDataEvent.PoniesEmoteRooms, updatedContent);
+      await (mx as any).setAccountData(AccountDataEvent.PoniesEmoteRooms, updatedContent);
     }, [mx, selectedPacks, removedPacks]),
   );
 

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}