Refactor chat shortcuts and notifications, fix linting issues - #1830

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TypeError: supabase.auth.onAuthStateChange is not a function ❯ src/hooks/useSkillEndorsements.ts:49:54 ❯ commitHookEffectListMount node_modules/react-dom/cjs/react-dom.development.js:23189:26 ❯ commitPassiveMountOnFiber node_modules/react-dom/cjs/react-dom.development.js:24970:11 ❯ commitPassiveMountEffects_complete node_modules/react-dom/cjs/react-dom.development.js:24930:9 ❯ commitPassiveMountEffects_begin node_modules/react-dom/cjs/react-dom.development.js:24917:7 ❯ commitPassiveMountEffects node_modules/react-dom/cjs/react-dom.development.js:24905:3 ❯ flushPassiveEffectsImpl node_modules/react-dom/cjs/react-dom.development.js:27078:3 ❯ flushPassiveEffects node_modules/react-dom/cjs/react-dom.development.js:27023:14 ❯ node_modules/react-dom/cjs/react-dom.development.js:26808:9 ❯ flushActQueue node_modules/react/cjs/react.development.js:2667:24

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-node@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

React Hook useCallback has an unnecessary dependency: 'toast'. Either exclude it or remove the dependency array. Outer scope values like 'toast' aren't valid dependencies because mutating them doesn't re-render the component