feat: Show error message if WebView2 not installed (#285)

* feat: Show error message if WebView2 not installed
on Windows

* fix: Add missing dependency

* fix: Do not import lib on OS where not needed
Don't need to import Windows lib on Linux

* feat: Link to troubleshooting page directly

* chore: Update comments

* docs: Show error message in troubleshooting guide
Show the "WebView2 not installed" error message in the troubleshooting
guide

* fix: Resolve clippy error

* fix: Resolve clippy error (again)

2 files changed, 7 insertions, 1 deletions

diff --git a/docs/TROUBLESHOOTING.md b/docs/TROUBLESHOOTING.md
index aed174e0..d36b1e1f 100644
--- a/docs/TROUBLESHOOTING.md
+++ b/docs/TROUBLESHOOTING.md
@@ -4,7 +4,13 @@ Got an issue with FlightCore? Hopefully one of the steps below will help you res
 
 ## FlightCore won't launch
 
-If you are on Windows on FlightCore won't start, make sure you have WebView2 installed. You can grab the latest version from the Microsoft website: \
+If you are on Windows and FlightCore won't start but instead shows an error message like this
+
+![webview2 error message windows](assets/flightcore-webview2-windows-error-message.png)
+
+that means that WebView2 is not installed. WebView2 is an embedded browser framework used by FlightCore to display its GUI.
+
+To install it, you can grab the latest version from the Microsoft website: \
 https://developer.microsoft.com/en-us/microsoft-edge/webview2/#download-section
 
 ![webview2 download screenshot](assets/webview2-download-screenshot.png)
diff --git a/docs/assets/flightcore-webview2-windows-error-message.png b/docs/assets/flightcore-webview2-windows-error-message.png
new file mode 100644
index 00000000..bbe4422f
--- /dev/null
+++ b/docs/assets/flightcore-webview2-windows-error-message.png