fix(types): correct typing for contentIcons and controlPanelsIcons

[Shauryan0207]

Description

contentIcons and controlPanelsIcons in config.Settings are typed as Record<string, React.ComponentType> but should be Record<string, string> because they contain SVG file paths, not React components.

Changes

• Fixed contentIcons type from React.ComponentType to string
• Fixed controlPanelsIcons type from React.ComponentType to string
• Added changelog entry

Checklist

• I signed the Plone Contributor Agreement
• Verified no other PRs for this change
• Followed Volto contribution guidelines
• No tests needed (type-only fix)
• Added changelog entry: packages/types/news/7339.bugfix

Related

Closes #7339

[mister-roboto]

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[Shauryan0207]

I have signed it

[stevepiercy]

@Shauryan0207 please read and follow the third and fourth sentences. After that's completed, then add a comment stating that you've completed the process.