Playground style updates

[OAGr]

(95% of this can be reviewed now, but still have some small adjustments to make)

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Latest commit: db6de0c953a73143cfa01b6b8b10769c12f8f6ee

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This PR includes changesets to release 7 packages

| Name | Type | | ----------------------------------- | ----- | | @quri/versioned-squiggle-components | Patch | | @quri/squiggle-components | Patch | | @quri/ui | Patch | | vscode-squiggle | Patch | | @quri/squiggle-lang | Patch | | @quri/prettier-plugin-squiggle | Patch | | @quri/squiggle-textmate-grammar | Patch |

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[OAGr]

TODO:

• Change "Private Variables" to "All Variables"
• Change "Exports" to "Exported Variables"
• Maybe, later, show imports in the "All variables" list, as they sort of are variables.
• Revert pill styling.