fix: fallback to hardcoded Edge/Chrome/Firefox Windows browser paths if user's default browser no longer exists (#3262)

To reproduce:

- Use Windows
- Set your default browser to Firefox (Settings -> Apps -> Default Apps -> Web Browser)
- Rename your firefox.exe to something.else

The BrowserOpenURL before this commit silently fails.

The BrowserOpenURL after this commit tries to use a hardcoded fallback browser.
If successful, a warning message is logged.
If unsuccessful (default browser and fallback browsers fail), an error message is logged.

Co-authored-by: Sean <sean@malonetuning.com>

v2/internal/frontend/desktop/darwin/browser.go

@@ -10,5 +10,7 @@ import (
 // BrowserOpenURL Use the default browser to open the url
 func (f *Frontend) BrowserOpenURL(url string) {
 	// Specific method implementation
-	_ = browser.OpenURL(url)
+	if err := browser.OpenURL(url); err != nil {
+		f.logger.Error("Unable to open default system browser")
+	}
 }

v2/internal/frontend/desktop/linux/browser.go

@@ -8,5 +8,7 @@ import "github.com/pkg/browser"
 // BrowserOpenURL Use the default browser to open the url
 func (f *Frontend) BrowserOpenURL(url string) {
 	// Specific method implementation
-	_ = browser.OpenURL(url)
+	if err := browser.OpenURL(url); err != nil {
+		f.logger.Error("Unable to open default system browser")
+	}
 }

v2/internal/frontend/desktop/windows/browser.go

@@ -5,10 +5,31 @@ package windows
 
 import (
 	"github.com/pkg/browser"
+	"golang.org/x/sys/windows"
 )
 
+var fallbackBrowserPaths = []string{
+	`\Program Files (x86)\Microsoft\Edge\Application\msedge.exe`,
+	`\Program Files\Google\Chrome\Application\chrome.exe`,
+	`\Program Files (x86)\Google\Chrome\Application\chrome.exe`,
+	`\Program Files\Mozilla Firefox\firefox.exe`,
+}
+
 // BrowserOpenURL Use the default browser to open the url
 func (f *Frontend) BrowserOpenURL(url string) {
 	// Specific method implementation
-	_ = browser.OpenURL(url)
+	err := browser.OpenURL(url)
+	if err == nil {
+		return
+	}
+	for _, fallback := range fallbackBrowserPaths {
+		if err := openBrowser(fallback, url); err == nil {
+			return
+		}
+	}
+	f.logger.Error("Unable to open default system browser")
+}
+
+func openBrowser(path, url string) error {
+	return windows.ShellExecute(0, nil, windows.StringToUTF16Ptr(path), windows.StringToUTF16Ptr(url), nil, windows.SW_SHOWNORMAL)
 }