Update to React 18, convert all remaining .js files to typescript

[shanelile]

This is primarily a large overhaul to ensure all files are in typescript. In addition to that, I've updated React to 18. I've done some cursory testing across the bigger pages I've changed and things generally seem to work, however some controls, especially some of the complexity we have for managing answers, potentially could have regressions. However I think the risk of regressing those now so that we can modernize everything is worth it and we can get those fixed before RC.

Fixes #53 and #73

PR Overview

This PR updates the codebase to TypeScript and upgrades React to version 18 while modernizing component implementations. Key changes include the full conversion of remaining JavaScript files to TypeScript, migration of class components to functional components using React Hooks, and updates to various UI components for consistency with the new standards.

Reviewed Changes

File	Description
client/src/Home.tsx	New TypeScript Home component using React Router redirects.
client/src/MicrosoftAuthService.ts	Converted to TypeScript with updated MSAL integration.
client/src/actions/staff/gridDataHooks.ts	Rewritten as a TypeScript hook for managing staff grid data.
client/src/components/account/UserAccount.tsx	Converted to TypeScript and updated to modern functional component style.
client/src/components/player/fragments/ChallengeSubmissionFragment.tsx	Converted to TypeScript with functional component implementation.
client/src/components/errors/Forbidden.tsx	New TypeScript error page for forbidden access.
client/src/components/player/PlayerActiveCall.tsx	Converted to TypeScript with React Hooks and updated prop types.
client/src/components/admin/AdminEvents.tsx	Updated to TypeScript with minor styling and JSX improvements.
client/src/components/admin/AdminEventSummary.tsx	Converted to TypeScript and improved component readability.
client/src/components/player/PlayerPlot.tsx	Converted to TypeScript with updated formatting and component restructuring.
client/src/components/admin/dialogs/EventInstanceForm.tsx	Converted to TypeScript and updated event instance form behavior.
client/src/components/player/CallManager.tsx	Converted to TypeScript with updated Hooks usage and callback functions.

Copilot reviewed 91 out of 91 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

client/src/components/player/PlayerActiveCall.tsx:26

• It appears that the condition for updating team notes mistakenly calls setPublicNotes instead of setTeamNotes. Consider changing it to setTeamNotes(currentCall.teamNotes) to correctly update the team notes state.

if (teamNotes && teamNotes !== currentCall.teamNotes) { setPublicNotes(currentCall.teamNotes); }