Restyle to a clean, flat look and rename brand to SCOPENET

- Brand is now SCOPENET everywhere (defaults, UI, installer, docs)
- Launcher: solid backgrounds (no animated orbs/grain), flat Play button
  without gradient/shine/glow, quieter rail with a simple active
  indicator, smaller type scale, Inter as default font, glass off by
  default, restyled sliders
- Panel: same flat treatment; live preview mirrors the new launcher
- New flat scope-reticle logo and app icons
- Calmer default palette
- Fix: lock the shared cargo cache in the Docker build (amd64/arm64 raced)
- Fix: Windows-only clippy lint in sys.rs

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011ARcGWxLx21FwXJ3yfGriS

crates/shared/src/lib.rs

@@ -1,4 +1,4 @@
-//! Wire types shared by the ScopeNet launcher and the admin panel.
+//! Wire types shared by the SCOPENET launcher and the admin panel.
 //!
 //! Everything the panel sends to the launcher is described here, so both
 //! sides always agree on the JSON shape.
@@ -39,19 +39,19 @@ pub struct Branding {
 impl Default for Branding {
     fn default() -> Self {
         Self {
-            name: "ScopeNet".into(),
+            name: "SCOPENET".into(),
             tagline: "Your worlds, one click away.".into(),
             logo_url: None,
             icon_url: None,
             background: Background::default(),
             colors: Palette::default(),
-            font: "Outfit".into(),
-            radius: 14,
-            glass: true,
-            version_label: "ScopeNet".into(),
+            font: "Inter".into(),
+            radius: 10,
+            glass: false,
+            version_label: "SCOPENET".into(),
             news: vec![NewsItem {
                 id: "welcome".into(),
-                title: "Welcome to ScopeNet".into(),
+                title: "Welcome to SCOPENET".into(),
                 body: "Your admin can customise this launcher from the panel: colours, news, instances and more.".into(),
                 image_url: None,
                 link: None,
@@ -80,7 +80,7 @@ pub struct Background {
 
 impl Default for Background {
     fn default() -> Self {
-        Self { kind: "gradient".into(), url: None, blur: 0, dim: 45 }
+        Self { kind: "gradient".into(), url: None, blur: 0, dim: 55 }
     }
 }
 
@@ -100,14 +100,14 @@ pub struct Palette {
 impl Default for Palette {
     fn default() -> Self {
         Self {
-            accent: "#7c5cff".into(),
-            accent_2: "#22d3ee".into(),
-            background: "#0b0d17".into(),
-            surface: "#141828".into(),
-            text: "#eef0ff".into(),
-            muted: "#8b90b3".into(),
-            success: "#34d399".into(),
-            danger: "#f43f5e".into(),
+            accent: "#6d6af5".into(),
+            accent_2: "#8b88f8".into(),
+            background: "#0d0e12".into(),
+            surface: "#16181e".into(),
+            text: "#ecedf1".into(),
+            muted: "#8b8f9a".into(),
+            success: "#3fb97c".into(),
+            danger: "#e5484d".into(),
         }
     }
 }
@@ -396,7 +396,7 @@ mod tests {
     #[test]
     fn manifest_roundtrip_with_defaults() {
         let m: LauncherManifest = serde_json::from_str("{}").unwrap();
-        assert_eq!(m.branding.name, "ScopeNet");
+        assert_eq!(m.branding.name, "SCOPENET");
         let loader: Loader = serde_json::from_str("\"neoforge\"").unwrap();
         assert_eq!(loader, Loader::NeoForge);
     }