fix note title color for legacy themes

[Nriver]

fix second part of #7984

[gemini-code-assist]

Summary of Changes

Hello @Nriver, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a visual inconsistency where the active note title within the Fancytree component did not properly display the custom theme color in legacy dark and light themes. The changes introduce specific CSS rules to apply the appropriate custom color variable to the active Fancytree span element, thereby resolving the display bug and enhancing the visual coherence of the user interface.

Highlights

• Note Title Coloring: Ensures that the active note title in the Fancytree component correctly uses the custom theme color for both dark and light legacy themes.

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[gemini-code-assist]

Code Review

This pull request aims to fix an issue where the custom color of a note title is lost when the note becomes active in the tree view for legacy themes. While the proposed changes in theme-dark.css and theme-light.css address this for colored notes, they introduce a side effect for non-colored notes. Specifically, in the dark theme, it causes an accessibility issue due to low text-to-background contrast for active items. My review includes suggestions to refine the CSS rules to correctly apply colors only to the intended notes by using the existing --custom-color variable with a fallback, thus resolving the original issue without introducing new problems.