refactor: Improve version handling and cleanup version-related files

aider/__init__.py

@@ -4,14 +4,17 @@ __version__ = "0.65.2.dev"
 safe_version = __version__
 
 try:
-    from aider.__version__ import __version__
+    from aider._version import __version__
 except Exception:
-    __version__ = safe_version + ".import"
+    __version__ = safe_version + "+import"
 
-try:
-    if version.parse(__version__) < version.parse(safe_version):
-        __version__ = safe_version + ".less"
-except Exception:
-    __version__ = safe_version + ".parse"
+if type(__version__) is not str:
+    __version__ = safe_version + "+type"
+else:
+    try:
+        if version.parse(__version__) < version.parse(safe_version):
+            __version__ = safe_version + "+less"
+    except Exception:
+        __version__ = safe_version + "+parse"
 
 __all__ = [__version__]

aider/commands.py

@@ -914,7 +914,7 @@ class Commands:
 
     def cmd_quit(self, args):
         "Exit the application"
-        sys.exit()
+        self.cmd_exit(args)
 
     def cmd_ls(self, args):
         "List all known files and indicate which are included in the chat session"

aider/main.py

@@ -949,6 +949,10 @@ def is_first_run_of_new_version(io, verbose=False):
     installs_file = Path.home() / ".aider" / "installs.json"
     key = (__version__, sys.executable)
 
+    # Never show notes for .dev versions
+    if ".dev" in __version__:
+        return False
+
     if verbose:
         io.tool_output(
             f"Checking imports for version {__version__} and executable {sys.executable}"