fix(ui-test): ensure app unconfigured before setup flow tests

Add Verify App Is Unconfigured keyword with retry logic.
Update Test Setup to reset app state before each setup flow test.
Remove stale Task 25 docs from tasks.md.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

tests/robot/resources/common.resource

@@ -96,6 +96,19 @@ Is Auth Configured
     ${configured_val}=    Set Variable    ${configured}[0]
     RETURN    ${configured_val}
 
+Verify App Is Unconfigured
+    [Documentation]    Verify the app is in unconfigured state, retrying reset if needed.
+    FOR    ${i}    IN RANGE    3
+        ${configured}=    Is Auth Configured
+        IF    not ${configured}
+            RETURN
+        END
+        # Not configured but Is Auth Configured returned True - reset again
+        Reset Application State
+        Sleep    1s
+    END
+    Fail    App still configured after 3 reset attempts
+
 Setup Master Password
     [Documentation]    Configure the master password via the setup endpoint.
     ${payload}=    Create Dictionary