Improve error handling, ensure robust defaults, and eliminate unsafe unwraps/expectations across modules.

Software/MainBoard/rust/src/fat_error.rs

@@ -1,5 +1,7 @@
 use alloc::format;
 use alloc::string::{String, ToString};
+use chrono::format::ParseErrorKind;
+use chrono_tz::ParseError;
 use core::convert::Infallible;
 use core::fmt;
 use core::fmt::Debug;
@@ -149,6 +151,23 @@ impl<T> ContextExt<T> for Option<T> {
     }
 }
 
+impl<T, E> ContextExt<T> for Result<T, E>
+where
+    E: fmt::Debug,
+{
+    fn context<C>(self, context: C) -> Result<T, FatError>
+    where
+        C: AsRef<str>,
+    {
+        match self {
+            Ok(value) => Ok(value),
+            Err(err) => Err(FatError::String {
+                error: format!("{}: {:?}", context.as_ref(), err),
+            }),
+        }
+    }
+}
+
 impl From<Error<Infallible>> for FatError {
     fn from(error: Error<Infallible>) -> Self {
         FatError::OneWireError { error }
@@ -283,7 +302,7 @@ impl<E: fmt::Debug> From<ShuntVoltageReadError<I2cDeviceError<E>>> for FatError
 
 impl From<Infallible> for FatError {
     fn from(value: Infallible) -> Self {
-        panic!("Infallible error: {:?}", value)
+        match value {}
     }
 }
 
@@ -336,3 +355,27 @@ impl From<BmsProtocolError> for FatError {
         }
     }
 }
+
+impl From<ParseError> for FatError {
+    fn from(value: ParseError) -> Self {
+        FatError::String {
+            error: format!("Parsing error: {value:?}"),
+        }
+    }
+}
+
+impl From<ParseErrorKind> for FatError {
+    fn from(value: ParseErrorKind) -> Self {
+        FatError::String {
+            error: format!("Parsing error: {value:?}"),
+        }
+    }
+}
+
+impl From<chrono::format::ParseError> for FatError {
+    fn from(value: chrono::format::ParseError) -> Self {
+        FatError::String {
+            error: format!("Parsing error: {value:?}"),
+        }
+    }
+}