Refactor schematics to use hierarchical labels instead of global labels #85
Description
The current schematics overuse global labels, which makes the design messy and harder to manage, especially as it grows. This PR replaces global labels with hierarchical sheets and pins, keeping signals modular and organized.
By using hierarchical labels:
• Signals are confined to their relevant sheets.
• The schematic is cleaner and easier to read.
• Risk of accidental net conflicts across the project is reduced.
Please review PR #84 for the full changes.