chore: remove "Root CMS" in meta title with minimalBranding

[stevenle]

Motivation

• Improve readability and address inline feedback by moving the nested inline conditional that builds the page <title> into a small, explicit helper.

Description

• Add getCmsTitle(projectName: string, minimalBranding?: boolean) to packages/root-cms/core/app.tsx and replace the inline nested ternary in renderApp() with getCmsTitle(projectName, cmsConfig.minimalBranding), preserving the prior behavior where the title is 'Root CMS' when no project name is present, the project name alone when minimalBranding is true, and <projectName> – Root CMS otherwise.

Testing

• No automated tests were run for this change.

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