settings: every page commits from the header

The Mail, Assistant and Ask presets pages got a Save and Discard pair in
the page header; the rest still had their own buttons wherever their
page put them: User's Save at the bottom, Wallpaper's Apply and Reset
beside the mock screens, Icons' Apply and Reset under the cursor cards,
HyprSunset's and HyprIdle's Save + Restart in the page. They now all sit
in the header SaveBar, which takes the page's own verbs (Apply and
Reset, Save + Restart) and a busy state.

HyprSunset and HyprIdle had no notion of an unsaved change, so their
button was always live. They now count as changed when what save()
would write differs from what was read, which enables Save only then,
gives Discard (a reload) something to drop, and marks them in the
sidebar; a window open no longer reloads them over unsaved edits. The
staged cursor moved from IconsTab into the Icons singleton so the
header and the sidebar can see it.

Git and autostart act a row at a time, and a theme applies on click, so
those have no bar.

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

1 files changed, 3 insertions, 12 deletions

diff --git a/desktop/modules/appearance/WallpaperTab.qml b/desktop/modules/appearance/WallpaperTab.qml
index 9788ba2..af3c23b 100644
--- a/desktop/modules/appearance/WallpaperTab.qml
+++ b/desktop/modules/appearance/WallpaperTab.qml
@@ -85,7 +85,7 @@ Column {
                 width: parent.width
                 wrapMode: Text.Wrap
                 text: tab.hovering !== "" ? Wallpapers.label(tab.hovering)
-                    : Wallpapers.dirty ? "click Apply to set"
+                    : Wallpapers.dirty ? "Apply, in the header, sets it"
                     : "click a wallpaper to stage it"
                 font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 4 }
                 color: Theme.overlay
@@ -111,17 +111,8 @@ Column {
                 width: parent.width
                 spacing: 8
 
-                Tab {
-                    text: Wallpapers.applying ? "applying…" : "Apply"
-                    selected: Wallpapers.dirty && !Wallpapers.applying
-                    enabled: Wallpapers.dirty && !Wallpapers.applying
-                    onClicked: Wallpapers.apply()
-                }
-                Tab {
-                    text: "Reset"
-                    enabled: Wallpapers.dirty && !Wallpapers.applying
-                    onClicked: Wallpapers.clearPending()
-                }
+                // Apply and Reset are in the page header, with every settings
+                // page's.
                 // wallhaven-dl searches wallhaven.cc and finds larger
                 // copies of low-res wallpapers. Launched through its
                 // desktop entry, which needs no ~/bin on quickshell's PATH