feat: allow nesting string token ref / fix CSS var in string token ref fallback

[astahmer]

📝 Description

Allow nesting (string) token references in the fallback argument, fix an issue where using CSS var in the fallback argument would be mistakenly escaped

⛳️ Current behavior (updates)

css({ color: "token(colors.red.300, token(colors.blue.500, yellow))" )}
// ❌ -> "var(--colors-red-300, token\\(colors\\.blue\\.500))"

css({ color: "token(colors.red.300, var(--some-var, var(--another-var, purple)))" )}
// ❌ -> "var(--colors-red-300, var\\(--some-var)))"

🚀 New behavior

css({ color: "token(colors.red.300, token(colors.blue.500, yellow))" )}
// ✅ -> "var(--colors-red-300, var(--colors-blue-500, yellow))"

css({ color: "token(colors.red.300, var(--some-var, var(--another-var, purple)))" )}
// ✅ -> "var(--colors-red-300, var(--some-var, var(--another-var, purple)))"

💣 Is this a breaking change (Yes/No):

no

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[changeset-bot]

🦋 Changeset detected

Latest commit: 91c1750

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 19 packages

Name	Type
@pandacss/token-dictionary	Patch
@pandacss/parser	Patch
@pandacss/core	Patch
@pandacss/dev	Patch
@pandacss/generator	Patch
@pandacss/node	Patch
@pandacss/studio	Patch
@pandacss/astro-plugin-studio	Patch
@pandacss/postcss	Patch
@pandacss/config	Patch
@pandacss/extractor	Patch
@pandacss/is-valid-prop	Patch
@pandacss/logger	Patch
@pandacss/preset-atlaskit	Patch
@pandacss/preset-base	Patch
@pandacss/preset-open-props	Patch
@pandacss/preset-panda	Patch
@pandacss/shared	Patch
@pandacss/types	Patch

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