feat(Footer): create Footer widget with project name and portfolio link

src/widgets/Footer/index.ts

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+export { default as Footer } from './ui/Footer.svelte';

src/widgets/Footer/ui/Footer.stories.svelte

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+<script module lang="ts">
+import { defineMeta } from '@storybook/addon-svelte-csf';
+import Footer from './Footer.svelte';
+
+const { Story } = defineMeta({
+    title: 'Widgets/Footer',
+    component: Footer,
+    tags: ['autodocs'],
+    parameters: {
+        docs: {
+            description: {
+                component:
+                    'Application footer with project information and portfolio link. Visible only on desktop screens.',
+            },
+            story: { inline: false },
+        },
+        layout: 'fullscreen',
+    },
+});
+</script>
+
+<Story
+    name="Desktop View"
+    parameters={{
+        viewport: { defaultViewport: 'desktop' },
+    }}
+>
+    {#snippet template()}
+        <div class="h-[200px] relative bg-neutral-50 dark:bg-neutral-900">
+            <Footer />
+        </div>
+    {/snippet}
+</Story>
+
+<Story
+    name="Mobile View (Hidden)"
+    parameters={{
+        viewport: { defaultViewport: 'mobile1' },
+    }}
+>
+    {#snippet template()}
+        <div class="h-[200px] relative bg-neutral-50 dark:bg-neutral-900">
+            <p class="p-4 text-sm text-neutral-500 italic">Footer should be hidden on mobile.</p>
+            <Footer />
+        </div>
+    {/snippet}
+</Story>

src/widgets/Footer/ui/Footer.svelte

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+<!--
+    Widget: Footer
+    Application footer with project information and portfolio link.
+    Visible only on desktop screens.
+-->
+<script lang="ts">
+import type { ResponsiveManager } from '$shared/lib/helpers';
+import { FooterLink } from '$shared/ui';
+import { getContext } from 'svelte';
+
+const responsive = getContext<ResponsiveManager>('responsive');
+const currentYear = new Date().getFullYear();
+</script>
+
+{#if responsive?.isDesktop || responsive?.isDesktopLarge}
+    <footer class="fixed bottom-5 right-5 z-50 flex flex-col items-end gap-1 pointer-events-none">
+        <!-- Portfolio Link (Vertical) -->
+        <div class="pointer-events-auto">
+            <FooterLink
+                text="allmy.work"
+                href="https://allmy.work/"
+                target="_blank"
+                rel="noopener noreferrer"
+                class="border border-subtle"
+            />
+        </div>
+
+        <!-- Project Name (Horizontal) -->
+        <div class="pointer-events-auto flex items-center gap-2 bg-surface/80 dark:bg-dark-bg/80 backdrop-blur-sm px-3 py-1 border border-subtle">
+            <div class="w-1.5 h-1.5 bg-brand"></div>
+            <span class="text-2xs font-mono uppercase tracking-wider-mono text-neutral-500 dark:text-neutral-400">
+                GlyphDiff © 2025 — {currentYear}
+            </span>
+        </div>
+    </footer>
+{/if}

src/widgets/Footer/ui/Footer.svelte.test.ts

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+import {
+    render,
+    screen,
+} from '@testing-library/svelte';
+import { setContext } from 'svelte';
+import Footer from './Footer.svelte';
+
+// Mock component to provide context
+import ContextWrapper from '$shared/lib/providers/ResponsiveProvider/ResponsiveProvider.svelte';
+
+describe('Footer', () => {
+    const currentYear = new Date().getFullYear();
+
+    it('renders on desktop', () => {
+        // Mock responsive context
+        const mockResponsive = {
+            isDesktop: true,
+            isDesktopLarge: false,
+        };
+
+        const { container } = render(Footer, {
+            context: new Map([['responsive', mockResponsive]]),
+        });
+
+        expect(screen.getByText(`GlyphDiff © 2025 — ${currentYear}`)).toBeInTheDocument();
+        expect(screen.getByText('allmy.work')).toBeInTheDocument();
+    });
+
+    it('renders on large desktop', () => {
+        const mockResponsive = {
+            isDesktop: false,
+            isDesktopLarge: true,
+        };
+
+        render(Footer, {
+            context: new Map([['responsive', mockResponsive]]),
+        });
+
+        expect(screen.getByText(`GlyphDiff © 2025 — ${currentYear}`)).toBeInTheDocument();
+    });
+
+    it('does not render on mobile or tablet', () => {
+        const mockResponsive = {
+            isDesktop: false,
+            isDesktopLarge: false,
+        };
+
+        render(Footer, {
+            context: new Map([['responsive', mockResponsive]]),
+        });
+
+        expect(screen.queryByText(/GlyphDiff/)).not.toBeInTheDocument();
+    });
+});