2027 Menu Renderer

## Summary
We need a new menu style to go with the 2027 theme.

## Technical Spec
Replace the existing 2026 menu renderer with a shiny new one.
## UI
Support all of the interaction the previous renderer supports.

## Mockups

## How to Test
Navigate through the main menu.

Find where the 2026 menu renderer is implemented and how the firmware selects the active theme. Then identify the corresponding 2027 renderer path and compare its integration point with the existing menu interaction handlers to preserve behavior. No specific files or tests are listed, so build/run the firmware and follow the provided manual check by navigating the main menu; done means the 2027 renderer is active without regressions in menu interaction.

由索引模型根據 Issue 內容生成。