Fix RBAC role system bugs and improve UX (#446)

* Fix RBAC role system bugs and improve UX

- Fix user list dropdown selection in host sharing
- Fix role sharing permissions to include role-based access
- Fix translation template interpolation for success messages
- Standardize system roles to admin and user only
- Auto-assign user role to new registrations
- Remove blocking confirmation dialogs in modal contexts
- Add missing i18n keys for common actions
- Fix button type to prevent unintended form submissions

* Enhance RBAC system with UI improvements and security fixes

- Move role assignment to Users tab with per-user role management
- Protect system roles (admin/user) from editing and manual assignment
- Simplify permission system: remove Use level, keep View and Manage
- Hide Update button and Sharing tab for view-only/shared hosts
- Prevent users from sharing hosts with themselves
- Unify table and modal styling across admin panels
- Auto-assign system roles on user registration
- Add permission metadata to host interface

* Add empty state message for role assignment

- Display helpful message when no custom roles available
- Clarify that system roles are auto-assigned
- Add noCustomRolesToAssign translation in English and Chinese

* fix: Prevent credential sharing errors for shared hosts

- Skip credential resolution for shared hosts with credential authentication
  to prevent decryption errors (credentials are encrypted per-user)
- Add warning alert in sharing tab when host uses credential authentication
- Inform users that shared users cannot connect to credential-based hosts
- Add translations for credential sharing warning (EN/ZH)

This prevents authentication failures when sharing hosts configured
with credential authentication while maintaining security by keeping
credentials isolated per user.

* feat: Improve rbac UI and fixes some bugs

---------

Co-authored-by: Luke Gustafson <88517757+LukeGus@users.noreply.github.com>
Co-authored-by: LukeGus <bugattiguy527@gmail.com>

src/ui/desktop/apps/host-manager/HostManagerViewer.tsx

@@ -61,6 +61,8 @@ import {
   HardDrive,
   Globe,
   FolderOpen,
+  Share2,
+  Users,
 } from "lucide-react";
 import type {
   SSHHost,
@@ -1230,6 +1232,14 @@ export function HostManagerViewer({ onEditHost }: SSHManagerHostViewerProps) {
                                         {host.name ||
                                           `${host.username}@${host.ip}`}
                                       </h3>
+                                      {(host as any).isShared && (
+                                        <Badge
+                                          variant="outline"
+                                          className="text-xs px-1 py-0 text-violet-500 border-violet-500/50"
+                                        >
+                                          {t("rbac.shared")}
+                                        </Badge>
+                                      )}
                                     </div>
                                     <p className="text-xs text-muted-foreground truncate">
                                       {host.ip}:{host.port}