fix(dev-preview): address code review issues

- Use get_logger() from src.logging_config instead of logging.getLogger()
  in visual_display_manager.py to match project logging conventions
- Eliminate duplicate public/private weather draw methods — public draw_sun/
  draw_cloud/draw_rain/draw_snow now delegate to the private _draw_* variants
  so plugins get consistent pixel output in tests vs production
- Default install_deps=False in dev_server.py and render_plugin.py — dev
  scripts don't need to run pip install; developers are expected to have
  plugin deps installed in their venv already
- Guard plugins_dir fixture against PermissionError during directory iteration
- Fix PluginInstallManager.updateAll() to fall back to window.installedPlugins
  when PluginStateManager.installedPlugins is empty (plugins_manager.js
  populates window.installedPlugins independently of PluginStateManager)
- Remove 5 debug console.log statements from plugins_manager.js button setup
  and initialization code

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

test/plugins/conftest.py

@@ -30,12 +30,17 @@ def plugins_dir():
     plugin_repos_path = project_root / 'plugin-repos'
 
     # Prefer plugins/ if it has actual plugin directories
-    if plugins_path.exists() and any(
-        p for p in plugins_path.iterdir()
-        if p.is_dir() and not p.name.startswith('.')
-    ):
-        return plugins_path
-    elif plugin_repos_path.exists():
+    if plugins_path.exists():
+        try:
+            has_plugins = any(
+                p for p in plugins_path.iterdir()
+                if p.is_dir() and not p.name.startswith('.')
+            )
+            if has_plugins:
+                return plugins_path
+        except PermissionError:
+            pass
+    if plugin_repos_path.exists():
         return plugin_repos_path
     return plugins_path