🛠️ Improvement: Add story generator script and fix Storybook standalone build for propel

Problem

The packages/propel design system has 55+ components but story coverage is incomplete, and adding stories manually for each new component is repetitive and error-prone. Additionally, Storybook fails to start because Vite cannot resolve @plane/constants workspace symlinks at dev time, blocking local design system development.

Proposed solution

1. Story generator script (pnpm generate-story <ComponentName>)

A Node.js script that reads helper.tsx (CVA variants + TypeScript props) and auto-generates a complete .stories.tsx file:

• Per-variant named stories (Primary, ErrorFill, etc.)
• AllVariants and AllSizes render stories
• Full argTypes with select / boolean / text controls
• Resolves type TXxx = "a" | "b" aliases for proper select dropdowns
• Safe by default — refuses to overwrite existing stories without --force

Usage:

cd packages/propel
pnpm generate-story Button        # generates button.stories.tsx
pnpm generate-story AIInput       # detects AI prefix → "AI Components" category
pnpm generate-story Badge --force # overwrites existing story

2. Audit script (pnpm audit-stories)

Reports story coverage across all propel components:

✅ badge         — story complete
✅ button        — story complete  
❌ accordion     — no story
⚠️  tooltip      — empty story

3. Storybook Vite fix

@plane/constants is a workspace package referenced via symlink. Vite's import analysis fails to resolve it during pnpm storybook. Fix: inline the two values used (EIconSize enum and AXIS_LABEL_CLASSNAME string) directly in the files that need them, removing the external dependency from the Storybook build.

Implementation

Already implemented in PR #9518. The PR passes lint (oxlint) and format (oxfmt) checks via the pre-commit hook.

Not yet included (pending workflow OAuth scope):

• .github/workflows/ds-story-coverage.yml — a PR check that comments story coverage delta and fails if a new component folder is added without a .stories.tsx

Checklist

• Unit tests for generate-story.mjs (parsing CVA variants, type alias resolution)
• Unit tests for audit.mjs
• Workflow file in a follow-up PR once workflow scope is available

References

• PR: #9518

Start with PR #9518 and inspect the referenced generate-story.mjs and audit.mjs scripts in packages/propel, along with the Storybook Vite configuration. The implementation is already under review; remaining work mentioned by the issue includes unit tests and the .github/workflows/ds-story-coverage.yml follow-up.