feat: show crash reason on boot (#1453)

## Summary

If the system reboots from crash, display the reason and tell user to
include `crash_report.txt` file.

To test this, simply add an `assert(false)` somewhere inside the code.


![screenshot-74453.bmp](https://github.com/user-attachments/files/26160373/screenshot-74453.bmp)

---

### AI Usage

While CrossPoint doesn't have restrictions on AI tools in contributing,
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/activities/ActivityManager.h

@@ -86,6 +86,7 @@ class ActivityManager {
   void goToSleep();
   void goToBoot();
   void goToFullScreenMessage(std::string message, EpdFontFamily::Style style = EpdFontFamily::REGULAR);
+  void goToCrashReport();
   void goHome();
 
   // This will move current activity to stack instead of deleting it