Restructure frontend TS files so managers/stores export destructors instead of returning them from their constructors (#3919)

* Replace parameter passing with getContext and extract destroy functions to module-level exports

* Resend layouts from Rust when editor is re-mounted on HMR

* Code review

frontend/eslint.config.js

@@ -70,6 +70,7 @@ export default defineConfig([
 					ignoreRestSiblings: true,
 				},
 			],
+			"@typescript-eslint/no-non-null-assertion": "error",
 			"@typescript-eslint/consistent-type-imports": "error",
 			"@typescript-eslint/consistent-type-definitions": ["error", "type"],
 			"@typescript-eslint/consistent-type-assertions": ["error", { assertionStyle: "never" }],