feat: extract normalized style snapshot from Figma node JSON

[hungify]

Summary

• Adds extractFigmaStyle(node): StyleSnapshot in packages/verify/src/figma-node-style.ts — a pure function that normalizes a raw Figma node's document JSON (the same shape already fetched by fetch-baseline.ts's GET /v1/files/:fileKey/nodes call) into { color?, spacing?, fontSize?, fontWeight?, cornerRadius? }.
• color: first visible SOLID fill's color (r/g/b 0–1 floats), converted to a normalized lowercase hex string (#e5e5e5). Non-solid and invisible fills are skipped.
• spacing: paddingTop/Right/Bottom/Left (only present on auto-layout frames) normalized into { top, right, bottom, left }; absent entirely on non-auto-layout nodes.
• fontSize/fontWeight: read from TEXT node's style (TypeStyle).
• cornerRadius: flat field when present.
• boundVariables on a fill is deliberately never read — SolidPaint.color is always the resolved literal even when bound to a Figma Variable, and resolving the binding itself needs the Enterprise-only Variables API (out of scope for this feature).
• Every field is independently optional; a well-formed-but-partial node never throws, it just omits that field from the snapshot.
• This is the Figma-side half only (issue Figma-side style extraction (StyleSnapshot) #5). The DOM/computed-CSS side (Code-side computed-style capture #6) and pipeline wiring (Per-contract threshold override #7) are separate, parallel/blocked tickets — nothing in verify.ts, the compare pipeline, or packages/playwright was touched.

Test plan

• TDD, one seam/test/impl cycle at a time, seam = extractFigmaStyle(node)
• New packages/verify/tests/figma-node-style.test.ts (8 tests): normalized hex color from first visible SOLID fill, auto-layout padding → spacing, TEXT node fontSize/fontWeight, cornerRadius, resolved literal color still returned when fill is variable-bound (boundVariables ignored), skips invisible/non-solid fills, empty snapshot + no throw on a fully-missing node, only-missing-fields omitted on a partial node
• Full packages/verify suite green (108/108 across 22 files)
• pnpm run typecheck clean (strict TS, no any)
• pnpm run check:domain-boundary clean

Closes #5

Summary by CodeRabbit

• New Features

  • Added extraction of visual styles from design nodes, including colors, spacing, typography, and corner radius.
  • Added support for exporting the style extraction capability and its associated type.

• Tests

  • Added coverage for solid fills, variable-bound colors, auto-layout spacing, text styles, corner radius, empty results, and partial node data.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: d43329fd-0c51-4079-8191-bbee9c6086f4

📥 Commits

Reviewing files that changed from the base of the PR and between 37902e7 and dec9d51.

📒 Files selected for processing (2)

• packages/verify/src/figma-node-style.ts
• packages/verify/tests/figma-node-style.test.ts

📝 Walkthrough

Walkthrough

Adds StyleSnapshot and extractFigmaStyle for normalized Figma color, spacing, typography, and corner-radius data. Exports the API and adds Vitest coverage for complete and partial node styles.

Changes

Figma style extraction

Layer / File(s)	Summary
Style snapshot extraction packages/verify/src/figma-node-style.ts	Defines optional style fields and extracts padding, typography, corner radius, and the first visible solid fill. RGB channels are clamped and converted to hexadecimal.
Package API and extraction coverage packages/verify/src/index.ts, packages/verify/tests/figma-node-style.test.ts	Exports extractFigmaStyle and StyleSnapshot. Tests cover normalized colors, variable-bound fills, fill filtering, spacing, typography, corner radius, and missing fields.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: 🔵 Low · up to 37902

The new style snapshot API is mergeable with owner awareness, but it currently reports zero spacing for padding sides that are absent from the Figma node, which can produce inaccurate style comparisons for partial auto-layout data.

Possibly related PRs

• hungify/framelia#13: Defines a related StyleSnapshot and extraction helper for rendered Playwright elements.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: extracting a normalized style snapshot from Figma node JSON.
Linked Issues check	✅ Passed	The implementation meets issue #5 by extracting normalized color, spacing, typography, and corner radius values while omitting missing fields safely.
Out of Scope Changes check	✅ Passed	The source, exports, and tests directly support issue #5; DOM extraction and pipeline wiring remain out of scope.

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch worktree-issue-5-style-snapshot

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Actionable comments posted: 1

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Inline comments:
In `@packages/verify/src/figma-node-style.ts`:
- Around line 37-50: Update the padding handling in the spacing construction so
it returns undefined unless paddingTop, paddingRight, paddingBottom, and
paddingLeft are all present; remove the nullish-zero defaults and only create
the spacing object when every side has a value.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e6d675ed-a756-4b27-8a67-8e89bbf7fb26

📥 Commits

Reviewing files that changed from the base of the PR and between 507510e and 37902e7.

📒 Files selected for processing (3)

• packages/verify/src/figma-node-style.ts
• packages/verify/src/index.ts
• packages/verify/tests/figma-node-style.test.ts

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