API improvements

hamstertools/app.py

@@ -1,6 +1,7 @@
 from textual.app import App
 
 from .db import db
+from .kimaiapi import KimaiAPI
 
 from .screens.hamster import HamsterScreen
 from .screens.kimai import KimaiScreen
@@ -8,12 +9,21 @@ from .screens.kimai import KimaiScreen
 
 class HamsterToolsApp(App):
     CSS_PATH = "app.tcss"
+
     BINDINGS = [
         ("h", "switch_mode('hamster')", "Hamster"),
         ("k", "switch_mode('kimai')", "Kimai"),
         ("q", "quit", "Quit"),
     ]
 
+    api_ = None
+
+    @property
+    def api(self) -> KimaiAPI:
+        if self.api_ is None:
+            self.api_ = KimaiAPI()
+        return self.api_
+
     def __init__(self):
         self.MODES = {
             "hamster": HamsterScreen(),