Add get_last_src_edit

diff --git a/src/seedsigner/controller.py b/src/seedsigner/controller.py
index a151d3f..6284a46 100644
--- a/src/seedsigner/controller.py
+++ b/src/seedsigner/controller.py
@@ -1,3 +1,4 @@
+from datetime import datetime
 import logging
 import os
 import time
@@ -479,16 +480,23 @@ class Controller(Singleton):
         return Destination(UnhandledExceptionView, view_args={"error": error}, clear_history=True)
 
 
-    def get_display_version(self) -> str:
+    def get_version(self) -> str:
         """
-            Returns a user-friendly version string for display in the UI.
+            Returns either the hard-coded Controller.VERSION or a dynamically detected
+            version string for display in the UI. In local dev will return either the
+            current git branch name or commit hash.
         """
         name = f"v{VERSION}"
         if Settings.HOSTNAME == Settings.SEEDSIGNER_OS:
             return name
-        
+
         # We're in local dev; pull info from .git/HEAD if we can
-        git_HEAD_path = os.path.join(os.getcwd(), "..", ".git", "HEAD")
+        git_HEAD_dir = os.getcwd()
+
+        # Main app runs from src/ dir, tests and screenshot generator from project root
+        if "src" in git_HEAD_dir:
+            git_HEAD_dir = os.path.join(git_HEAD_dir, "..")
+        git_HEAD_path = os.path.join(git_HEAD_dir, ".git", "HEAD")
 
         if os.path.exists(git_HEAD_path):
             with open(git_HEAD_path, "r") as f:
@@ -501,3 +509,26 @@ class Controller(Singleton):
                     name = git_ref[:7]
 
         return name
+
+
+    def get_last_src_edit(self) -> datetime:
+        """
+        Recursively scan the src/ directory for the most recent python file edit time and
+        return it.
+        """
+        src_path = os.getcwd()
+        print(f"{src_path=}")
+        if "src" not in src_path:
+            # Screenshot generator runs from the project root
+            src_path = os.path.join(src_path, "src")
+        
+        print(f"{src_path=}")
+        latest_mtime = 0
+        for dirpath, dirnames, filenames in os.walk(src_path):
+            for filename in filenames:
+                if filename.endswith(".py"):
+                    filepath = os.path.join(dirpath, filename)
+                    mtime = os.path.getmtime(filepath)
+                    if mtime > latest_mtime:
+                        latest_mtime = mtime
+        return datetime.fromtimestamp(latest_mtime)
\ No newline at end of file
diff --git a/src/seedsigner/gui/screens/settings_screens.py b/src/seedsigner/gui/screens/settings_screens.py
index 9d26cc0..14e27d2 100644
--- a/src/seedsigner/gui/screens/settings_screens.py
+++ b/src/seedsigner/gui/screens/settings_screens.py
@@ -1,3 +1,4 @@
+import datetime
 import time
 
 from dataclasses import dataclass
@@ -313,6 +314,7 @@ class DonateScreen(BaseTopNavScreen):
 @dataclass
 class VersionScreen(BaseTopNavScreen):
     version: str = None
+    last_edit: datetime = None
 
     def __post_init__(self):
         self.title = _("Version")
@@ -323,6 +325,7 @@ class VersionScreen(BaseTopNavScreen):
         font = Fonts.get_font(font_name, font_size)
         (left, char_height, char_width, bottom) = font.getbbox("X", anchor="ls")
 
+        num_version_lines = 1
         if len(self.version) * char_width > self.canvas_width - 2*GUIConstants.EDGE_PADDING:
             max_chars_width = int((self.canvas_width - 2*GUIConstants.EDGE_PADDING) / char_width)
             # Add as many line breaks as needed for the version string to fit
@@ -333,10 +336,14 @@ class VersionScreen(BaseTopNavScreen):
                 else:
                     wrapped_version.append(self.version[i:])
             self.version = "\n".join(wrapped_version)
+            num_version_lines = len(wrapped_version)
         
         # Center the version vertically
         char_height *= -1  # due to the "ls" (baseline) anchor, height is negative
-        screen_y = int((self.canvas_height - self.top_nav.height) / 2) + self.top_nav.height - char_height*len(wrapped_version)
+
+        # Note: we roughly account for the last edit display's vertical space by adding to
+        # num_version_lines.
+        screen_y = int((self.canvas_height - self.top_nav.height) / 2) + self.top_nav.height - char_height*(num_version_lines + 1)
 
         self.components.append(TextArea(
             text=self.version,
@@ -346,6 +353,13 @@ class VersionScreen(BaseTopNavScreen):
             screen_y=screen_y,
         ))
 
+        last_edit_str = self.last_edit.strftime("%Y-%m-%d\n%H:%M:%S UTC")
+        self.components.append(TextArea(
+            text=last_edit_str,
+            is_text_centered=True,
+            screen_y=self.components[-1].screen_y + self.components[-1].height + 2*GUIConstants.COMPONENT_PADDING,
+        ))
+
 
 
 @dataclass
diff --git a/src/seedsigner/views/screensaver.py b/src/seedsigner/views/screensaver.py
index c8c51c7..25be5cc 100644
--- a/src/seedsigner/views/screensaver.py
+++ b/src/seedsigner/views/screensaver.py
@@ -97,7 +97,7 @@ class OpeningSplashScreen(LogoScreen):
 
         # Display version num below SeedSigner logo
         font = Fonts.get_font(GUIConstants.get_body_font_name(), GUIConstants.get_top_nav_title_font_size())
-        version = controller.get_display_version()
+        version = controller.get_version()
 
         # The logo png is 240x240, but the actual logo is 70px tall, vertically centered
         logo_height = 70
diff --git a/src/seedsigner/views/settings_views.py b/src/seedsigner/views/settings_views.py
index df03e43..9bc2ff6 100644
--- a/src/seedsigner/views/settings_views.py
+++ b/src/seedsigner/views/settings_views.py
@@ -327,11 +327,11 @@ class VersionView(View):
     def run(self):
         from seedsigner.controller import Controller
         controller = Controller.get_instance()
-        version = controller.get_display_version()
 
         self.run_screen(
             settings_screens.VersionScreen,
-            version=version
+            version=controller.get_version(),
+            last_edit=controller.get_last_src_edit(),
         )
 
         return Destination(SettingsMenuView)
\ No newline at end of file
diff --git a/tests/screenshot_generator/generator.py b/tests/screenshot_generator/generator.py
index e45373f..3d32678 100644
--- a/tests/screenshot_generator/generator.py
+++ b/tests/screenshot_generator/generator.py
@@ -425,6 +425,7 @@ def generate_screenshots(locale):
             "Settings Views": settings_views_list + [
                 ScreenshotConfig(settings_views.IOTestView),
                 ScreenshotConfig(settings_views.DonateView),
+                ScreenshotConfig(settings_views.VersionView),
                 ScreenshotConfig(settings_views.SettingsIngestSettingsQRView, dict(data=settingsqr_data_persistent), screenshot_name="SettingsIngestSettingsQRView_persistent"),
                 ScreenshotConfig(settings_views.SettingsIngestSettingsQRView, dict(data=settingsqr_data_not_persistent), screenshot_name="SettingsIngestSettingsQRView_not_persistent"),
             ],