Refactor App.tsx from god component to context-based architecture

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/web/src/__tests__/test-providers.tsx

@@ -0,0 +1,28 @@
+import type { ReactNode } from "react";
+import {
+	BestiaryProvider,
+	BulkImportProvider,
+	EncounterProvider,
+	InitiativeRollsProvider,
+	PlayerCharactersProvider,
+	SidePanelProvider,
+	ThemeProvider,
+} from "../contexts/index.js";
+
+export function AllProviders({ children }: { children: ReactNode }) {
+	return (
+		<ThemeProvider>
+			<EncounterProvider>
+				<BestiaryProvider>
+					<PlayerCharactersProvider>
+						<BulkImportProvider>
+							<SidePanelProvider>
+								<InitiativeRollsProvider>{children}</InitiativeRollsProvider>
+							</SidePanelProvider>
+						</BulkImportProvider>
+					</PlayerCharactersProvider>
+				</BestiaryProvider>
+			</EncounterProvider>
+		</ThemeProvider>
+	);
+}