feat: Implement M3 design elevation & shadow effects

- Added global toggles in the Themes tab
- Light color & directional user ovverides
- Independent shadow overrides per/bar
- Refactored various components to sync the updated designs

quickshell/Common/settings/SettingsSpec.js

@@ -21,7 +21,7 @@ var SPEC = {
     widgetColorMode: { def: "default" },
     controlCenterTileColorMode: { def: "primary" },
     buttonColorMode: { def: "primary" },
-    cornerRadius: { def: 12, onChange: "updateCompositorLayout" },
+    cornerRadius: { def: 16, onChange: "updateCompositorLayout" },
     niriLayoutGapsOverride: { def: -1, onChange: "updateCompositorLayout" },
     niriLayoutRadiusOverride: { def: -1, onChange: "updateCompositorLayout" },
     niriLayoutBorderSize: { def: -1, onChange: "updateCompositorLayout" },
@@ -47,6 +47,15 @@ var SPEC = {
     modalAnimationSpeed: { def: 1 },
     modalCustomAnimationDuration: { def: 150 },
     enableRippleEffects: { def: true },
+    m3ElevationEnabled: { def: true },
+    m3ElevationIntensity: { def: 12 },
+    m3ElevationOpacity: { def: 30 },
+    m3ElevationColorMode: { def: "default" },
+    m3ElevationLightDirection: { def: "top" },
+    m3ElevationCustomColor: { def: "#000000" },
+    modalElevationEnabled: { def: true },
+    popoutElevationEnabled: { def: true },
+    barElevationEnabled: { def: true },
     wallpaperFillMode: { def: "Fill" },
     blurredWallpaperLayer: { def: false },
     blurWallpaperOnOverview: { def: false },
@@ -432,7 +441,7 @@ var SPEC = {
             scrollYBehavior: "workspace",
             shadowIntensity: 0,
             shadowOpacity: 60,
-            shadowColorMode: "text",
+            shadowColorMode: "default",
             shadowCustomColor: "#000000",
             clickThrough: false
         }], onChange: "updateBarConfigs"

quickshell/Common/settings/SettingsStore.js

@@ -229,6 +229,25 @@ function migrateToVersion(obj, targetVersion) {
         settings.configVersion = 5;
     }
 
+    if (currentVersion < 6) {
+        console.info("Migrating settings from version", currentVersion, "to version 6");
+
+        if (settings.barElevationEnabled === undefined) {
+            var legacyBars = Array.isArray(settings.barConfigs) ? settings.barConfigs : [];
+            var hadLegacyBarShadowEnabled = false;
+            for (var j = 0; j < legacyBars.length; j++) {
+                var legacyIntensity = Number(legacyBars[j] && legacyBars[j].shadowIntensity);
+                if (!isNaN(legacyIntensity) && legacyIntensity > 0) {
+                    hadLegacyBarShadowEnabled = true;
+                    break;
+                }
+            }
+            settings.barElevationEnabled = hadLegacyBarShadowEnabled;
+        }
+
+        settings.configVersion = 6;
+    }
+
     return settings;
 }