[karthik] fix: resolve debugger filepath-not-found on Linux

On Linux (case-sensitive FS), Directory.py lowercased child paths
before os.path.isfile(), so mixed-case files like Apps.py were never
indexed. Debugleton.py then lowercased the lookup too, guaranteeing
no match. Fix: store real paths always; on darwin only, lowercase
both sides at compare time. Closes #58.

debugger/debugger_backend/Debugleton.py

@@ -1,5 +1,6 @@
 # Haik: sorry bout the filename
 
+import sys
 import threading
 from debugger_backend.project_scanner import update_debug_toggles
 from debugger_backend.Directory import Directory
@@ -75,12 +76,15 @@ class Debugleton:
         return self.sync_lock.locked()
 
     def find_file_info(self, filepath: str):
-        filepath = filepath.lower()
         # print(f"Finding file info for {filepath}")
         if self.needs_resync():
             self.sync_to_saved()
         try:
-            filepath_id = self.abspaths.index(filepath)
+            if sys.platform == "darwin":
+                abspaths = [p.lower() for p in self.abspaths]
+                filepath_id = abspaths.index(filepath.lower())
+            else:
+                filepath_id = self.abspaths.index(filepath)
             match = self.instances[filepath_id]
             return match.color, match.is_toggled, match.emoji
         except ValueError:

debugger/debugger_backend/Directory.py

@@ -41,7 +41,7 @@ class Directory:
             ordered_abspaths.append({"abspath": full_path, "instance": dir})
             # print(f"\t[construct_ordered_abspaths]: Full path: {full_path}")
             for child in dir.children:
-                child_abspath = os.path.join(root_dir, child.path).lower()
+                child_abspath = os.path.join(root_dir, child.path)
                 if os.path.isdir(child_abspath):
                     construct_ordered_abspaths(child, ordered_abspaths)
                 elif os.path.isfile(child_abspath):