Add Storybook baseline for UI primitives

docs/decisions/ADR-0030-storybook-baseline-vite-8-compatibility.md

@@ -0,0 +1,43 @@
+# ADR-0030: Storybook Baseline with Vite 8 Compatibility
+
+- **Status**: Accepted
+- **Date**: 2026-04-09
+- **Deciders**: Taskdeck maintainers
+
+## Context
+
+Taskdeck uses Vite 8 in the frontend workspace. The Storybook baseline issue requested Storybook 8.x, but Storybook 8 does not support the Vite 8 toolchain used by the app.
+
+The team still needs a stable, reviewable component catalogue for the 17 `Td*` primitives, plus a place to validate visual variants without touching the production app.
+
+## Decision
+
+Use Storybook 10.3.x for the frontend Storybook baseline.
+
+Reasons:
+
+- Storybook 10.3.x supports `vite@^8.0.0`.
+- The CSF3 story format remains the same, so the story authoring model stays familiar.
+- The preview should import the app stylesheet so Storybook reflects the production component look and spacing as closely as practical.
+- Story files live in `src/stories/` to keep the component directory focused on runtime code.
+
+## Alternatives Considered
+
+- Storybook 8.x: rejected because it is not compatible with Vite 8.
+- Deferring Storybook entirely: rejected because the component library needs a reviewable baseline now.
+- Co-locating stories with components: workable, but rejected for this baseline because a centralized story directory keeps the setup simpler.
+
+## Consequences
+
+- Storybook can be built and maintained without downgrading Vite.
+- Visual review of `Td*` primitives is available through `npm run storybook` and `npm run storybook:build`.
+- Story files are excluded from the app typecheck, so production compilation stays focused on runtime code.
+- Future contributors have a recorded rationale for the Storybook version choice.
+
+## References
+
+- PR #807
+- Issue #251
+- `frontend/taskdeck-web/.storybook/main.ts`
+- `frontend/taskdeck-web/.storybook/preview.ts`
+- `frontend/taskdeck-web/src/stories/`

docs/decisions/INDEX.md

@@ -31,3 +31,4 @@
 | [0027](ADR-0027-cloud-target-topology-autoscaling.md) | Cloud Target Topology and Autoscaling Reference Architecture | Accepted | 2026-04-09 |
 | [0028](ADR-0028-staged-deployment-bluegreen-canary.md) | Staged Deployment — Blue/Green with Canary Verification | Accepted | 2026-04-09 |
 | [0029](ADR-0029-oidc-mfa-pluggable-identity.md) | OIDC/SSO Integration with Optional TOTP MFA | Accepted | 2026-04-09 |
+| [0030](ADR-0030-storybook-baseline-vite-8-compatibility.md) | Storybook Baseline with Vite 8 Compatibility | Accepted | 2026-04-09 |

frontend/taskdeck-web/.gitignore

@@ -10,6 +10,7 @@ lerna-debug.log*
 node_modules
 dist
 dist-ssr
+storybook-static
 *.local
 
 # Editor directories and files

frontend/taskdeck-web/.storybook/main.ts

@@ -0,0 +1,52 @@
+import type { StorybookConfig } from '@storybook/vue3-vite'
+
+function isPwaPlugin(plugin: unknown): boolean {
+  if (plugin && typeof plugin === 'object' && 'name' in plugin) {
+    const name = String((plugin as { name?: unknown }).name ?? '').toLowerCase()
+    return name.includes('pwa') || name.includes('workbox')
+  }
+  return false
+}
+
+function stripPwaPlugins(plugins: unknown[]): unknown[] {
+  const filtered: unknown[] = []
+
+  for (const plugin of plugins) {
+    if (Array.isArray(plugin)) {
+      // Recursively filter nested arrays but preserve the array structure
+      const filteredNested = stripPwaPlugins(plugin)
+      if (filteredNested.length > 0) {
+        filtered.push(filteredNested)
+      }
+      continue
+    }
+    if (!isPwaPlugin(plugin)) {
+      filtered.push(plugin)
+    }
+  }
+
+  return filtered
+}
+
+const config: StorybookConfig = {
+  stories: ['../src/**/*.stories.@(ts|tsx)'],
+  framework: {
+    name: '@storybook/vue3-vite',
+    options: {
+      docgen: 'vue-component-meta',
+    },
+  },
+  async viteFinal(viteConfig) {
+    // Strip PWA plugin — it is app-specific and breaks the Storybook build
+    // because the Storybook output includes large JS bundles that exceed
+    // the workbox precache size limit.
+    return {
+      ...viteConfig,
+      plugins: viteConfig.plugins
+        ? (stripPwaPlugins(viteConfig.plugins as unknown[]) as typeof viteConfig.plugins)
+        : viteConfig.plugins,
+    }
+  },
+}
+
+export default config

frontend/taskdeck-web/.storybook/preview.ts

@@ -0,0 +1,27 @@
+import type { Preview } from '@storybook/vue3-vite'
+import '../src/style.css'
+
+const preview: Preview = {
+  parameters: {
+    controls: { expanded: true },
+    backgrounds: {
+      default: 'obsidian',
+      values: [
+        { name: 'obsidian', value: '#131313' },
+        { name: 'light', value: '#f5f3f1' },
+      ],
+    },
+  },
+  decorators: [
+    (story) => ({
+      components: { story },
+      template: `
+        <div style="padding: 1rem;">
+          <story />
+        </div>
+      `,
+    }),
+  ],
+}
+
+export default preview