fix: address OAuth review findings (redirect_uri, binding, timeout, CRLF, DRY)

composeApp/src/commonMain/kotlin/ch/parano/myice/auth/TokenParser.kt

@@ -0,0 +1,10 @@
+package ch.parano.myice.auth
+
+internal fun parseAccessTokenFromFragment(fragment: String): String? {
+    val params = fragment.split("&").associate { pair ->
+        val idx = pair.indexOf("=")
+        if (idx >= 0) pair.substring(0, idx) to pair.substring(idx + 1)
+        else pair to ""
+    }
+    return params["access_token"]
+}