Add FUSE fix wizard with pkexec installation

Dashboard shows a banner when FUSE is not functional. The wizard
detects the distro, shows the install command, and runs it via pkexec.
Verifies FUSE status after installation completes.

src/core/fuse.rs

@@ -307,6 +307,53 @@ fn extract_os_field(content: &str, key: &str) -> Option<String> {
     None
 }
 
+/// Get the package install command suitable for running via pkexec (no sudo prefix).
+pub fn get_fuse_install_command() -> Option<String> {
+    let content = std::fs::read_to_string("/etc/os-release").ok()?;
+    let id = extract_os_field(&content, "ID");
+    let version_id = extract_os_field(&content, "VERSION_ID");
+    let id_like = extract_os_field(&content, "ID_LIKE");
+
+    match id.as_deref() {
+        Some("ubuntu") => {
+            let ver: f64 = version_id
+                .as_deref()
+                .and_then(|v| v.parse().ok())
+                .unwrap_or(0.0);
+            if ver >= 24.04 {
+                Some("apt install -y libfuse2t64".to_string())
+            } else {
+                Some("apt install -y libfuse2".to_string())
+            }
+        }
+        Some("debian") => Some("apt install -y libfuse2".to_string()),
+        Some("fedora") => Some("dnf install -y fuse-libs".to_string()),
+        Some("arch") | Some("manjaro") | Some("endeavouros") => {
+            Some("pacman -S --noconfirm fuse2".to_string())
+        }
+        Some("opensuse-tumbleweed") | Some("opensuse-leap") => {
+            Some("zypper install -y libfuse2".to_string())
+        }
+        _ => {
+            if let Some(like) = id_like.as_deref() {
+                if like.contains("ubuntu") || like.contains("debian") {
+                    return Some("apt install -y libfuse2".to_string());
+                }
+                if like.contains("fedora") {
+                    return Some("dnf install -y fuse-libs".to_string());
+                }
+                if like.contains("arch") {
+                    return Some("pacman -S --noconfirm fuse2".to_string());
+                }
+                if like.contains("suse") {
+                    return Some("zypper install -y libfuse2".to_string());
+                }
+            }
+            None
+        }
+    }
+}
+
 /// Check if AppImageLauncher is installed (known conflicts with new runtime).
 pub fn detect_appimagelauncher() -> Option<String> {
     let output = Command::new("dpkg")