fix/feat: improve theme & style code

[Spiral-Memory]

Brief Title

This PR improves the code slightly for better readability and consistency.

Acceptance Criteria Fulfillment

• [x] Slightly modified the theme structure by moving radius and commonColors to the root level.
• [x] Updated how the useTheme hook provides colors and invertedColors explicitly; now theme.colors must be used.
• [x] Consolidated multiple key exports into a single style object export.
• [x] Converted style hooks to standard getXYZStyle functions.
• [x] Updated docs & added try it out for all live projects

Fixes: N/A

[Spiral-Memory]

This PR is ready to merge. I’ve made some minor code updates and adjusted the theme and style implementations. The documentation has been updated to reflect these changes, including the addition of demo links in the README and other relevant documents.