Refine theme and typography for premium UI polish

[jamespepper81]

Updated platformStyles and theme color palettes for a more premium, high-contrast look inspired by high-end finance apps. Unified typography scale for better hierarchy and readability. Refactored styles in the main tab index to use new typography and spacing, improving layout consistency and visual balance.

This pull request focuses on visually refining the app's UI by enhancing the typography scale, updating color palettes for both light and dark themes, and standardizing style usage across the home screen. The changes promote a more premium, readable, and consistent appearance, especially on iOS-inspired surfaces. Additionally, some minor configuration improvements are made for the Java development environment.

UI and Theme Enhancements

• Major overhaul of the platformStyles.typography scale in constants/themes.ts for better readability, hierarchy, and consistency—font sizes, line heights, and weights have been increased and unified for headings, body, and captions.
• Updated the color palettes in both lightTheme and darkTheme within constants/themes.ts, shifting to a more premium, finance-app-inspired look with Bitcoin orange as the primary color, improved background/surface colors, and more consistent accent and border colors.

Home Screen Style Improvements (app/(tabs)/index.tsx)

• Refactored the home screen styles to use the new platformStyles.typography values throughout, ensuring consistent font sizes, weights, and spacing for headers, balances, subtitles, and labels. [1] [2] [3] [4]
• Improved layout and spacing: added top/bottom padding, centered key elements, adjusted margins, and enhanced card appearance with better border radii, shadows, and overflow handling. [1] [2] [3]

Code Cleanliness

• Removed unnecessary React import in app/(tabs)/index.tsx to clean up the import statements.

Development Environment

• Added "java.configuration.updateBuildConfiguration": "interactive" to .vscode/settings.json to improve Java build configuration management for developers.