* Hooks are in multiple places in the codebase and some camelCase, some snake-case. This PR relocates them all to the lib/hooks folder and normalizes camelCase naming. Settled on src/client/lib/hooks for the location since most of them were already there.
- Refactor/move useTheme.ts from client/src/lib to client/src/lib/hooks
- Refactor/move useToast.ts from client/src/hooks/ to client/src/lib/hooks/useToast.ts
- Removed client/src/hooks
