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/HostManagerEditor.tsx

@@ -37,6 +37,7 @@ import {
 } from "@/ui/main-axios.ts";
 import { useTranslation } from "react-i18next";
 import { CredentialSelector } from "@/ui/desktop/apps/credentials/CredentialSelector.tsx";
+import { HostSharingTab } from "./HostSharingTab.tsx";
 import CodeMirror from "@uiw/react-codemirror";
 import { oneDark } from "@codemirror/theme-one-dark";
 import { EditorView } from "@codemirror/view";
@@ -1189,6 +1190,11 @@ export function HostManagerEditor({
                   <TabsTrigger value="statistics">
                     {t("hosts.statistics")}
                   </TabsTrigger>
+                  {!editingHost?.isShared && (
+                    <TabsTrigger value="sharing">
+                      {t("rbac.sharing")}
+                    </TabsTrigger>
+                  )}
                 </TabsList>
                 <TabsContent value="general" className="pt-2">
                   <FormLabel className="mb-3 font-bold">
@@ -3327,18 +3333,27 @@ export function HostManagerEditor({
                     />
                   </div>
                 </TabsContent>
+
+                <TabsContent value="sharing" className="space-y-6">
+                  <HostSharingTab
+                    hostId={editingHost?.id}
+                    isNewHost={!editingHost?.id}
+                  />
+                </TabsContent>
               </Tabs>
             </div>
           </ScrollArea>
           <footer className="shrink-0 w-full pb-0">
             <Separator className="p-0.25" />
-            <Button className="translate-y-2" type="submit" variant="outline">
-              {editingHost
-                ? editingHost.id
-                  ? t("hosts.updateHost")
-                  : t("hosts.cloneHost")
-                : t("hosts.addHost")}
-            </Button>
+            {!(editingHost?.permissionLevel === "view") && (
+              <Button className="translate-y-2" type="submit" variant="outline">
+                {editingHost
+                  ? editingHost.id
+                    ? t("hosts.updateHost")
+                    : t("hosts.cloneHost")
+                  : t("hosts.addHost")}
+              </Button>
+            )}
           </footer>
         </form>
       </Form>