Add support for custom header logo image within assets dir

should avoid external URL for header logo where possible

.gitignore

@@ -1 +1,2 @@
 WuttaPOS.egg-info/
+wuttapos/assets/custom_header_logo.png

wuttapos/views/base.py

@@ -24,6 +24,10 @@
 WuttaPOS - flet views (base class)
 """
 
+import os
+
+from rattail.files import resource_path
+
 import flet as ft
 
 from wuttapos.controls.header import WuttaHeader
@@ -66,9 +70,17 @@ class WuttaView(ft.View):
         pass
 
     def make_logo_image(self, **kwargs):
-        logo = self.config.get('wuttapos', 'header.logo')
-        if not logo:
+
+        # we have a default header logo, but prefer custom if present
+        custom = resource_path('wuttapos:assets/custom_header_logo.png')
+        if os.path.exists(custom):
+            logo = '/custom_header_logo.png'
+        else:
             logo = '/header_logo.png'
+
+        # but config can override in any case
+        logo = self.config.get('wuttapos', 'header.logo', default=logo)
+
         kwargs.setdefault('height', 100)
         return ft.Image(src=logo, **kwargs)