Upgrade TinaCMS to add highlight support in the rich text editor

[Aibono1225]

Description

✏️
Relates to #2467
This pull request removes the custom useMarkHighlight hook and its usage throughout the codebase, likely in favor of a new or built-in highlighting approach. It also updates dependencies for TinaCMS and adds a "highlight" option to the TinaCMS toolbar configuration.

Removal of custom highlight logic:

• Deleted the useMarkHighlight hook and all related imports and invocations from TinaCategoryWrapper.tsx, TinaRuleWrapper.tsx, emailEmbed.tsx, and rule-list-item.tsx, simplifying these components and removing custom highlight processing. (app/[filename]/TinaCategoryWrapper.tsxL5-L6, app/[filename]/TinaCategoryWrapper.tsxL26-L28, app/[filename]/TinaRuleWrapper.tsxL3-L5, app/[filename]/TinaRuleWrapper.tsxL20-R19, [1] [2] [3] [4] [5]

Dependency updates:

• Upgraded @tinacms/cli from version 2.1.8 to 2.2.0 and tinacms from 3.5.0 to 3.7.0 in package.json, ensuring compatibility with newer TinaCMS features. [1] [2]

TinaCMS toolbar enhancements:

• Added "highlight" to the allowed toolbar fields and to the toolbarFields array in toolbarFields.ts, enabling highlight functionality directly in the TinaCMS editor. [1] [2]

Screenshot (optional)

✏️

[Aibono1225]

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[github-actions]

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Branch	2467-add-tinacms-highlight
Commit	d362b8a76eab7a99d93d2e239f5bebd8a01318e5

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