Fix dark mode text visibility issues

[graycreate]

Summary

• Fixed text visibility issues in dark mode for Explore and Message pages
• Ensures all text elements use appropriate adaptive colors for both light and dark themes

Changes

1. Explore Page: Updated "今日热议" (Today's Hot Topics) list item titles to use Color.primaryText instead of .bodyText for better dark mode visibility
2. Message Page:
   • Added explicit Color.primaryText foreground color to message titles
   • Changed reply content text from Color.bodyText to Color.secondaryText for improved contrast in dark mode

Test Plan

• Test Explore page in both light and dark modes
• Verify text visibility for hot topic items in Explore page
• Test Message page in both light and dark modes
• Verify message titles and reply content are clearly visible in dark mode
• Ensure no regressions in light mode appearance

🤖 Generated with Claude Code

[Copilot]

Pull Request Overview

This PR fixes text visibility issues in dark mode by updating color assignments for text elements in the Explore and Message pages. The changes ensure proper contrast and readability across both light and dark themes.

• Updated color assignments from generic body text colors to more appropriate semantic colors
• Enhanced dark mode compatibility for hot topic titles and message content
• Improved text hierarchy with better color differentiation

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
V2er/View/Message/MessagePage.swift	Updated message title color to primaryText and reply content to secondaryText for better dark mode visibility
V2er/View/Explore/ExplorePage.swift	Changed hot topic title color from .bodyText to Color.primaryText for improved dark mode contrast

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