refactor: remove core-ui from main (scaffoldable via gen core-package ui)

Removal across all three consumers:
- apps/storybook: strips @repo/core-ui dep, clears stories glob (now []),
  removes globals.css import from preview.ts
- apps/web-next: strips @repo/core-ui dep + transpilePackages entry
- apps/web-tanstack: strips @repo/core-ui dep
- packages/core-ui: deleted entirely (28 files)

No app pages needed surgery — neither web-next nor web-tanstack source
files imported @repo/core-ui directly. The storybook app referenced it
only via the stories glob and the globals.css preview import.

Gates: 40/40 tasks successful, all 4 e2e byte-identical reconstructions
pass (realtime, events, trpc, ui).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/core-ui/src/molecules/form-field/form-field.stories.tsx

@@ -1,31 +0,0 @@
-import type { Meta, StoryObj } from "@storybook/react";
-import { FormField } from "./form-field";
-
-const meta = {
-  title: "Molecules/FormField",
-  component: FormField,
-  tags: ["autodocs"],
-} satisfies Meta<typeof FormField>;
-export default meta;
-
-type Story = StoryObj<typeof meta>;
-
-export const Default: Story = {
-  args: { label: "Email", placeholder: "you@example.com", type: "email" },
-};
-
-export const WithDescription: Story = {
-  args: {
-    label: "Username",
-    placeholder: "johndoe",
-    description: "Must be 3-31 characters",
-  },
-};
-
-export const WithError: Story = {
-  args: {
-    label: "Password",
-    type: "password",
-    error: "Password must be at least 6 characters",
-  },
-};

packages/core-ui/src/molecules/form-field/form-field.test.tsx

@@ -1,33 +0,0 @@
-import { describe, it, expect } from "vitest";
-import { renderWithProviders } from "@repo/core-testing/react";
-import { screen } from "@testing-library/react";
-import { FormField } from "./form-field";
-
-describe("FormField", () => {
-  it("renders label associated with input via auto-derived id", () => {
-    renderWithProviders(<FormField label="Email Address" />);
-    const input = screen.getByLabelText("Email Address");
-    expect(input).toBeInTheDocument();
-    expect(input).toHaveAttribute("id", "email-address");
-  });
-
-  it("uses an explicit id over the derived one", () => {
-    renderWithProviders(<FormField label="Email" id="custom-id" />);
-    expect(screen.getByLabelText("Email")).toHaveAttribute("id", "custom-id");
-  });
-
-  it("renders a description when provided", () => {
-    renderWithProviders(<FormField label="Email" description="We never share it." />);
-    expect(screen.getByText("We never share it.")).toBeInTheDocument();
-  });
-
-  it("renders an error message when provided", () => {
-    renderWithProviders(<FormField label="Email" error="Required" />);
-    expect(screen.getByText("Required")).toBeInTheDocument();
-  });
-
-  it("forwards input props (e.g., type) to the underlying input", () => {
-    renderWithProviders(<FormField label="Email" type="email" />);
-    expect(screen.getByLabelText("Email")).toHaveAttribute("type", "email");
-  });
-});

packages/core-ui/src/molecules/form-field/form-field.tsx

@@ -1,31 +0,0 @@
-import { Label } from "../../atoms/label/index";
-import { Input, type InputProps } from "../../atoms/input/index";
-import { cn } from "../../lib/utils";
-
-export interface FormFieldProps extends InputProps {
-  label: string;
-  error?: string;
-  description?: string;
-}
-
-export function FormField({
-  label,
-  error,
-  description,
-  className,
-  id,
-  ...inputProps
-}: FormFieldProps) {
-  const fieldId = id ?? label.toLowerCase().replace(/\s+/g, "-");
-
-  return (
-    <div className={cn("space-y-2", className)}>
-      <Label htmlFor={fieldId}>{label}</Label>
-      <Input id={fieldId} {...inputProps} />
-      {description && (
-        <p className="text-sm text-muted-foreground">{description}</p>
-      )}
-      {error && <p className="text-sm text-destructive">{error}</p>}
-    </div>
-  );
-}

packages/core-ui/src/molecules/form-field/index.ts

@@ -1 +0,0 @@
-export { FormField, type FormFieldProps } from "./form-field";

packages/core-ui/src/molecules/index.ts

@@ -1 +0,0 @@
-export { FormField, type FormFieldProps } from "./form-field/index";