settings: one snackbar for every page's messages

Save, apply and upload results went to the page header, one line capped
at 420px and cut with an ellipsis. They now go to a snackbar at the foot
of the settings window, wrapped in full: green fades after 6s, yellow and
red stay until dismissed or replaced, and changing page clears it.

Snack.qml is the singleton pages call (ok, wait, error); Snackbar.qml
draws it once in Settings.qml. SaveBar forwards its notice and error, so
the 24 pages using it change nothing; the header keeps only the draft's
state. The boot logo page calls Snack directly.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/desktop/Settings.qml b/desktop/Settings.qml
index 2ba8cb6..507960b 100644
--- a/desktop/Settings.qml
+++ b/desktop/Settings.qml
@@ -91,6 +91,8 @@ Scope {
         else root.close();
     }
     function close() { root.open = false; root.page = ""; root.query = ""; }
+    // A message belongs to the page that said it.
+    onPageChanged: Snack.clear()
 
     LazyLoader {
         active: root.open
@@ -613,6 +615,13 @@ Scope {
                         when: pageLoader.item !== null
                     }
                 }
+
+                // Every page's save and upload results, in full. See Snack.qml.
+                Snackbar {
+                    anchors { bottom: pageLoader.bottom; horizontalCenter: pageLoader.horizontalCenter }
+                    width: Math.min(560, pageLoader.width - 32)
+                    z: 10
+                }
             }
         }
     }