fix(hyprland): guard malformed module events

The language and submap modules assumed their Hyprland payload delimiters were
always present. When that assumption is violated, the old code could perform
invalid iterator math or throw while slicing the event string.

Validate the expected separators up front and bail out with a warning when the
event is malformed so the modules degrade safely instead of crashing the update
path.

Signed-off-by: Austin Horstman <khaneliman12@gmail.com>

src/modules/hyprland/submap.cpp

@@ -75,7 +75,12 @@ void Submap::onEvent(const std::string& ev) {
     return;
   }
 
-  auto submapName = ev.substr(ev.find_first_of('>') + 2);
+  const auto separator = ev.find(">>");
+  if (separator == std::string::npos) {
+    spdlog::warn("hyprland submap received malformed event: {}", ev);
+    return;
+  }
+  auto submapName = ev.substr(separator + 2);
 
   submap_ = submapName;