Fix token parsing for Studio edge cases

[cursor]

Why does this PR exist?

Closes #3854
Closes #3856
Closes #3857

Recent issues reported token-loading/rendering failures and incorrect type buckets for tokens coming from Studio or malformed JSON.

What does this pull request do?

• Ignores non-string incoming token name metadata when normalizing parsed token JSON, so token paths still come from the JSON hierarchy.
• Tightens isSingleToken so groups with child tokens named name and value are not misidentified as leaf tokens.
• Normalizes Studio type aliases space -> spacing and size -> sizing during token conversion, including inherited group types.
• Adds regression coverage for the malformed name case, the name/value child-token group case, and Studio type aliases.

Testing this change

• Not run locally: this automation container does not have node, npm, yarn, or installed node_modules, so Jest/lint commands cannot start here.
• Attempted focused Jest command: yarn test --runTestsByPath src/utils/convertTokens.test.ts src/app/components/utils.test.ts --runInBand.

Additional Notes (if any)

The code changes are intentionally scoped to token conversion/type guarding and should be low-risk for existing valid token JSON.

  

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Latest commit: d701c43

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Commit SHA:7171f5393a3ae96c4fba4490d24cef3a0ef3f749

Test coverage results 🧪

Code coverage diff between base branch:main and head branch: cursor/figma-plugin-issue-review-180a 

Status	File	% Stmts	% Branch	% Funcs	% Lines
🟢	total	61.57 (0)	53.08 (0.03)	59.33 (0.01)	61.97 (0)
🟢	packages/tokens-studio-for-figma/src/utils/convertTokens.tsx	80.7 (0.31)	77.14 (1.76)	85.71 (2.38)	79.62 (0.46)