feat(Notepad): Complete refactor - New popout mode & settings

- Add a full popout Notepad experience w/new layout settings
- New ability to choose the left or right side of the screen
- Add more safegaurds to preserve user data throughout
- New banner to show file reload/conflict handling
- New extensionless file support
- Polish settings with gap controls, compact buttons, and shortcuts help

quickshell/Common/SettingsData.qml

@@ -520,13 +520,39 @@ Singleton {
     property real notificationSummaryFontSize: Spec.SPEC.notificationSummaryFontSize.def
     property real notificationBodyFontSize: Spec.SPEC.notificationBodyFontSize.def
     property bool notepadShowLineNumbers: false
+    property bool notepadAutoSave: false
+    property string notepadSlideoutSide: "right"
+    property string notepadDefaultMode: "slideout"
     property real notepadTransparencyOverride: -1
     property real notepadLastCustomTransparency: 0.7
+    property bool notepadUseCompositorGap: false
+    property int notepadEdgeGap: 0
+
+    // Compositor layout gap when enabled and available, else the manual value.
+    readonly property int notepadEffectiveEdgeGap: {
+        if (notepadUseCompositorGap) {
+            var g = -1;
+            if (CompositorService.isNiri)
+                g = niriLayoutGapsOverride;
+            else if (CompositorService.isHyprland)
+                g = hyprlandLayoutGapsOverride;
+            else if (CompositorService.isMango)
+                g = mangoLayoutGapsOverride;
+            if (g >= 0)
+                return g;
+        }
+        return Math.max(0, notepadEdgeGap);
+    }
 
     onNotepadUseMonospaceChanged: saveSettings()
     onNotepadFontFamilyChanged: saveSettings()
     onNotepadFontSizeChanged: saveSettings()
     onNotepadShowLineNumbersChanged: saveSettings()
+    onNotepadAutoSaveChanged: saveSettings()
+    onNotepadSlideoutSideChanged: saveSettings()
+    onNotepadDefaultModeChanged: saveSettings()
+    onNotepadUseCompositorGapChanged: saveSettings()
+    onNotepadEdgeGapChanged: saveSettings()
     // onCenteringModeChanged: saveSettings()
     onNotepadTransparencyOverrideChanged: {
         if (notepadTransparencyOverride > 0) {

quickshell/Common/settings/SettingsSpec.js

@@ -264,8 +264,13 @@ var SPEC = {
     notificationSummaryFontSize: { def: 0 },
     notificationBodyFontSize: { def: 0 },
     notepadShowLineNumbers: { def: false },
+    notepadAutoSave: { def: false },
+    notepadSlideoutSide: { def: "right" },
+    notepadDefaultMode: { def: "slideout" },
     notepadTransparencyOverride: { def: -1 },
     notepadLastCustomTransparency: { def: 0.7 },
+    notepadUseCompositorGap: { def: false },
+    notepadEdgeGap: { def: 0 },
 
     soundsEnabled: { def: true },
     useSystemSoundTheme: { def: false },