fix: improve error handling and type safety

- Replaced 'any' types with proper TypeScript types
- Improved error handling with instanceof checks
- Removed unused imports (calculateExpectedTeamScore)
- Updated error messages to be more descriptive
- Removed deprecated eslint.config.mjs file

src/components/EditTournamentForm.tsx

@@ -66,7 +66,7 @@ export default function EditTournamentForm({ tournament }: EditTournamentFormPro
       setTimeout(() => {
         router.push(`/admin/tournaments/${tournament.id}`)
       }, 2000)
-    } catch (err) {
+    } catch {
       setError("An error occurred. Please try again.")
       setIsLoading(false)
     }

src/components/MatchEditor.tsx

@@ -20,7 +20,7 @@ interface MatchData {
   table: string
 }
 
-export default function MatchEditor({ tournamentId, players, matches }: MatchEditorProps) {
+export default function MatchEditor({ tournamentId, players }: MatchEditorProps) {
   const [formData, setFormData] = useState<MatchData>({
     team1P1Id: null,
     team1P2Id: null,
@@ -120,7 +120,7 @@ export default function MatchEditor({ tournamentId, players, matches }: MatchEdi
       setTimeout(() => {
         window.location.reload()
       }, 1000)
-    } catch (err) {
+    } catch {
       setError("An error occurred. Please try again.")
       setIsLoading(false)
     }

src/components/SessionProvider.tsx

@@ -4,7 +4,7 @@ import { createContext, useContext, useEffect, useState } from "react"
 import { authClient } from "@/lib/auth-client"
 
 interface SessionContextType {
-  session: { user: any; session: any } | null
+  session: { user: unknown; session: unknown } | null
   loading: boolean
   refreshSession: () => Promise<void>
 }
@@ -12,7 +12,7 @@ interface SessionContextType {
 const SessionContext = createContext<SessionContextType | undefined>(undefined)
 
 export function SessionProvider({ children }: { children: React.ReactNode }) {
-  const [session, setSession] = useState<{ user: any; session: any } | null>(null)
+  const [session, setSession] = useState<{ user: unknown; session: unknown } | null>(null)
   const [loading, setLoading] = useState(true)
 
   const refreshSession = async () => {