docs: add delimiterSpacing toggle and global option docs

[luisherranz]

Summary

The docs and playground integration for the delimiterSpacing option PR:

• feat(formatter): add delimiterSpacing option biome#8966

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 4b84623f-e35b-4c37-9f58-2faf2c8d14eb

📥 Commits

Reviewing files that changed from the base of the PR and between 4a8bccc and d628e9c.

📒 Files selected for processing (5)

• src/content/docs/reference/configuration.mdx
• src/playground/PlaygroundLoader.tsx
• src/playground/tabs/SettingsTab.tsx
• src/playground/types.ts
• src/playground/workers/biomeWorker.ts

✅ Files skipped from review due to trivial changes (1)

• src/playground/types.ts

🚧 Files skipped from review as they are similar to previous changes (3)

• src/playground/PlaygroundLoader.tsx
• src/content/docs/reference/configuration.mdx
• src/playground/workers/biomeWorker.ts

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Walkthrough

Adds a new boolean formatter option delimiterSpacing (default false) and wires it through docs, playground state/types, UI, URL parsing, and the Biome worker. The setting is applied to javascript.formatter, json.formatter, and css.formatter in the worker and exposed in the Playground settings and docs; playground URL params and defaults now include delimiterSpacing.

Possibly related PRs

• feat: add gritql examples #4038 — Also updates PlaygroundLoader.initState to parse an additional URL/state field into the returned PlaygroundState; similar pattern to the new delimiterSpacing URL/state parsing.

Suggested reviewers

• arendjr
• Netail

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main changes: adding documentation and a playground toggle for the delimiterSpacing option.
Description check	✅ Passed	The description accurately explains that the PR adds documentation and playground integration for the delimiterSpacing option with a reference to the related core PR.

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🧪 Generate unit tests (beta)

• Create PR with unit tests

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