Fix tab color issues

[Blake-goofy]

Summary

Updates connection color handling so Axial SQL Tools more reliably colors query tabs and keeps text readable.

Changes

• Resolve tab connection info from the query document/frame instead of relying only on tab caption text.
• Keep caption parsing as a fallback for older/alternate SSMS tab layouts.
• Apply contrasting foreground colors for colored tabs and query status bars.
• Refresh open tab colors immediately after saving connection color rules.
• Update settings UI copy from “status bar color” to “status bar and tab color.”
• Keep the persisted StatusBarColor setting name for backward compatibility.

Testing

• Manually verified tab coloring works when SSMS tab captions only show file names.
• Manually verified changing a connection color rule updates open tabs immediately after save.