Settings: improve dark-theme readability for inactive tabs

[takasurazeem]

Summary

In Settings, non-selected tabs become hard to read on dark themes (especially Midnight) because the tab bar uses a muted on-surface token instead of a chrome-aware foreground token.

Problem

• Inactive tab labels in the Settings tab bar have insufficient contrast on dark chrome.
• Header/tab typography could be slightly stronger for readability.

Proposed/Fix

• Add theme-aware chrome text tokens for Settings chrome surfaces.
• Use chrome-specific secondary foreground for inactive tab labels.
• Keep selected tab foreground optimized for white selected chip.
• Slightly refine title/tab typography using shared typography tokens.

Screenshots

• Before (old):

• After (new):

Tracking

• PR: Fix Settings dark-theme tab readability #2