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/main.tsx

@@ -1,13 +1,36 @@
 import { StrictMode } from "react";
 import { createRoot } from "react-dom/client";
-import { App } from "./App";
+import { App } from "./App.js";
+import {
+	BestiaryProvider,
+	BulkImportProvider,
+	EncounterProvider,
+	InitiativeRollsProvider,
+	PlayerCharactersProvider,
+	SidePanelProvider,
+	ThemeProvider,
+} from "./contexts/index.js";
 import "./index.css";
 
 const root = document.getElementById("root");
 if (root) {
 	createRoot(root).render(
 		<StrictMode>
-			<App />
+			<ThemeProvider>
+				<EncounterProvider>
+					<BestiaryProvider>
+						<PlayerCharactersProvider>
+							<BulkImportProvider>
+								<SidePanelProvider>
+									<InitiativeRollsProvider>
+										<App />
+									</InitiativeRollsProvider>
+								</SidePanelProvider>
+							</BulkImportProvider>
+						</PlayerCharactersProvider>
+					</BestiaryProvider>
+				</EncounterProvider>
+			</ThemeProvider>
 		</StrictMode>,
 	);
 }