#11598 style(github-ui): keep muted text muted in every theme (follow-up to #11594)

Follow-up to #11594, which was merged at 6628a6e836. This adds the one commit pushed to the branch after that merge:

• 88446fe5a5 style(github-ui): the muted texts in the sync label column and the sync settings dialog fall back to Nebular's text-hint-color where the material themes don't define --gauzy-text-color-2. The new files are also formatted with the repository's Prettier config. No behaviour change.

Refs #7083. cc @evereq

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Summary by cubic

Fixes muted text in the GitHub sync label column and sync settings dialog so it stays muted in themes that don't define --gauzy-text-color-2, by falling back to Nebular's text-hint-color. Also formats the new files with the repository's Prettier config. No behavior change.