chore: catch up Storybook preview, coverage, and story hygiene

Stories were throwing without AuthModal/CreateFlow providers, autodocs was a no-op, and several DS/create-flow screens had no stories.

.storybook/main.js

@@ -4,32 +4,10 @@ module.exports = {
     "../stories/**/*.mdx",
     "../stories/**/*.stories.@(js|jsx|mjs|ts|tsx)",
   ],
-  addons: [
-    // Removed @storybook/addon-essentials due to version mismatch with Storybook 10.x
-    // Using individual addons instead. Interaction helpers import from storybook/test
-    // (bundled with storybook@10); @storybook/addon-interactions was merged into SB 8 core.
-    "@storybook/addon-a11y",
-  ],
+  addons: ["@storybook/addon-docs", "@storybook/addon-a11y"],
   framework: {
     name: "@storybook/nextjs",
     options: {},
   },
   staticDirs: ["../public"],
-
-  // Webpack configuration to resolve Next.js modules for Next.js 16 compatibility
-  async webpackFinal(config) {
-    // Ensure Next.js modules are resolved correctly
-    config.resolve = config.resolve || {};
-    config.resolve.alias = {
-      ...(config.resolve.alias || {}),
-    };
-
-    // Ensure node_modules are resolved
-    config.resolve.modules = [
-      ...(config.resolve.modules || []),
-      "node_modules",
-    ];
-
-    return config;
-  },
 };