fix(dashboard): correct unsupported-mode fallback warning f-string (#2094)

CHANGELOG.md

@@ -81,6 +81,8 @@ Status of the `main` branch. Changes prior to the next official version change w
     Serena's own tools to close the gap (#1852)
 
 * Dashboard:
+  - Fix: DashboardManager's unsupported-mode fallback warning logged the literal text
+    `{fallback_mode.value}` because only the first string fragment was an f-string
   - Fix: On macOS, the tray manager refreshed the tray menu straight from the Flask request handlers
     for `/register`, `/update_project` and `/unregister` and from the alive-check thread. That reaches
     `NSStatusItem.setMenu_()` off the main thread, which AppKit forbids and which recent macOS

src/serena/agent.py

@@ -439,7 +439,7 @@ class DashboardManager:
             fallback_mode = self.Mode.from_platform()
             log.warning(
                 f"Dashboard interface mode '{mode.value}' is not supported on the current platform; "
-                "falling back to '{fallback_mode.value}'."
+                f"falling back to '{fallback_mode.value}'."
             )
             mode = fallback_mode