feat(blocks): SectionGrid/InfoCard/ContactForm + Konsolidierung (Tier 1)

Neue Komponenten: SectionGrid, InfoCard (tone/compact), ArrowLink, ContactFormBlock,
SectionGridBlock. CMS-Blöcke section_grid + contact_form (info_card-Collection).
OrganisationsBlock: presentation "grid" (SectionGrid + InfoCard-Tiles).
Kontaktformular-Submit: size md + Send-Icon.

Konsolidierung Tier 1:
- .card-surface + Card-Atom → rounded-lg, .chip → rounded-full, Input-Atome → rounded-md
- tote .btn-*-Klassen aus app.css entfernt (Atom nutzt --color-btn-*-Tokens)
- hardcoded Hex → stein-Tokens (InfoCard, ContactFormBlock)
- redundante rounded-sm auf card-surface-Nutzern entfernt

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/lib/components/ArrowLink.stories.ts

@@ -0,0 +1,21 @@
+import type { Meta, StoryObj } from '@storybook/sveltekit';
+import ArrowLink from './ArrowLink.svelte';
+
+const meta = {
+  title: 'Molecules/ArrowLink',
+  component: ArrowLink,
+  tags: ['autodocs'],
+  parameters: { layout: 'centered' },
+  args: { href: '#', label: 'Mehr erfahren' },
+  argTypes: {
+    size: { control: 'select', options: ['sm', 'md'] },
+    external: { control: 'boolean' },
+  },
+} satisfies Meta<typeof ArrowLink>;
+
+export default meta;
+type Story = StoryObj<typeof meta>;
+
+export const Medium: Story = { args: { size: 'md', label: 'Zum Adressbuch' } };
+export const Klein: Story = { args: { size: 'sm', label: 'cloud.windwiderstand.de' } };
+export const Extern: Story = { args: { size: 'sm', label: 'Beitreten', external: true } };