fix: increase lyra sideButtonHintsWidth to 30 (#727)

## Summary

Increase the width of Lyra's side button hints. It has been set to 30,
the same width as the classic theme.


Before:
<img width="457" height="742" alt="image"
src="https://github.com/user-attachments/assets/316e4679-fbf0-4f6e-b117-413075da1be2"
/>

After:
<img width="512" height="849" alt="image"
src="https://github.com/user-attachments/assets/3b0cf069-55ad-4d5a-a93c-4aeca3ff67f8"
/>



## Additional Context

Resolves
https://github.com/crosspoint-reader/crosspoint-reader/pull/700#issuecomment-3856983832

---

### AI Usage

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please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code?
No

src/components/themes/lyra/LyraTheme.h

@@ -26,7 +26,7 @@ constexpr ThemeMetrics values = {.batteryWidth = 16,
                                  .homeCoverTileHeight = 287,
                                  .homeRecentBooksCount = 3,
                                  .buttonHintsHeight = 40,
-                                 .sideButtonHintsWidth = 19,
+                                 .sideButtonHintsWidth = 30,
                                  .versionTextRightX = 20,
                                  .versionTextY = 55,
                                  .bookProgressBarHeight = 4};