refactor(settings): remove wrapper layers, dead props and unused dictionary keys

- components/model-selector.tsx uses Dialog, Command and Tooltip
  directly; delete components/ai-elements/model-selector.tsx and
  components/button-with-tooltip.tsx; one renderGroups for both lists;
  no "Server · " prefix round trip
- components/ui: drop CommandDialog, CommandShortcut and six unused
  shadcn exports
- model-config-dialog: no type-to-confirm on provider delete;
  provider-credentials-fields: drop footer and bedrockApiKey
- hooks/use-model-config.ts and lib/types/model-config.ts: remove the
  2025-12 single-provider migration, resetConfig, selectedModel and
  fields nothing reads
- components/chat/TemplateFormDialog.tsx replaces the create and edit
  dialogs; TemplatePanel drops the setInput fallback, the
  templatesChanged listener, dictionary fallbacks and formatLastUsed;
  lib/template-storage.ts drops getTemplate, clickCount and indexes
- reasoning.tsx becomes one component; shimmer uses a CSS keyframe
  (motion and @radix-ui/react-use-controllable-state removed)
- error-toast.tsx deleted in favour of toast.error; ValidationCard
  drops the idle status; dev-xml-simulator uses English literals
- admin: no enum setting type, shared types from lib/admin
  (AdminProviderInput stays exported for that), ENABLE_HISTORY_XML_REPLACE
  entry removed
- app/globals.css: drop check-pop, --ease-spring, --duration-normal
  and the shadow aliases
- dictionaries: 81 unused keys removed from all four languages

app/[lang]/admin/admin-shared.ts

@@ -1,3 +1,5 @@
+import type { MaskedSecret as SecretValue } from "@/lib/admin/auth"
+import type { AdminProviderInput as AdminProvider } from "@/lib/admin/providers"
 import { getApiEndpoint } from "@/lib/base-path"
 import type { ProviderName } from "@/lib/types/model-config"
 
@@ -5,7 +7,10 @@ export const SESSION_PASSWORD_KEY = "next-ai-draw-io-admin-password"
 
 // ── Shared types ─────────────────────────────────────────────────────
 
-export type SecretValue = { isSet: true; hint: string }
+// The same shapes the admin API validates and returns. Secret fields of a
+// provider hold either a masked marker (unchanged) or a plaintext string
+// (new value).
+export type { AdminProvider, SecretValue }
 
 export function isSecretValue(v: unknown): v is SecretValue {
     return typeof v === "object" && v !== null && "isSet" in v
@@ -24,22 +29,6 @@ export function savedTextOf(state: SettingState | undefined): string {
     return state && !isSecretValue(state.value) ? (state.value ?? "") : ""
 }
 
-// Admin provider in client state. Secret fields hold either a masked
-// marker (unchanged) or a plaintext string (new value).
-export interface AdminProvider {
-    id: string
-    provider: ProviderName
-    name?: string
-    apiKey?: string | SecretValue
-    baseUrl?: string
-    awsAccessKeyId?: string | SecretValue
-    awsSecretAccessKey?: string | SecretValue
-    awsRegion?: string
-    vertexApiKey?: string | SecretValue
-    models: string[]
-    isDefault?: boolean
-}
-
 // Provider defined in AI_MODELS_CONFIG / ai-models.json — shown read-only
 export interface EnvProvider {
     name: string

app/[lang]/admin/setting-field.tsx

@@ -3,13 +3,6 @@ import { useState } from "react"
 import { Button } from "@/components/ui/button"
 import { Input } from "@/components/ui/input"
 import { Label } from "@/components/ui/label"
-import {
-    Select,
-    SelectContent,
-    SelectItem,
-    SelectTrigger,
-    SelectValue,
-} from "@/components/ui/select"
 import { Switch } from "@/components/ui/switch"
 import { useDictionary } from "@/hooks/use-dictionary"
 import type { SettingDef } from "@/lib/admin/settings-registry"
@@ -206,26 +199,6 @@ export function SettingField({
             )
             break
         }
-        case "enum":
-            control = (
-                <Select
-                    value={currentValue || undefined}
-                    disabled={disabled}
-                    onValueChange={onChange}
-                >
-                    <SelectTrigger id={inputId} className="w-full max-w-xs">
-                        <SelectValue placeholder={dict.admin.notSet} />
-                    </SelectTrigger>
-                    <SelectContent>
-                        {def.options?.map((opt) => (
-                            <SelectItem key={opt} value={opt}>
-                                {opt}
-                            </SelectItem>
-                        ))}
-                    </SelectContent>
-                </Select>
-            )
-            break
         case "secret":
             control = (
                 <div className="w-full max-w-md">

app/api/admin/settings/route.ts

@@ -53,10 +53,6 @@ function validateValue(def: SettingDef, value: string): string | null {
             return value === "true" || value === "false"
                 ? null
                 : 'Must be "true" or "false"'
-        case "enum":
-            return def.options?.includes(value)
-                ? null
-                : `Must be one of: ${def.options?.join(", ")}`
         default:
             return null
     }

app/globals.css

@@ -98,9 +98,7 @@
     --shadow-pop:
         0 1px 2px rgb(20 24 29 / 0.06), 0 18px 48px -12px rgb(20 24 29 / 0.22);
 
-    --duration-normal: 200ms;
     --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
-    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
 }
 
 /*
@@ -241,13 +239,6 @@
     .shadow-pop {
         box-shadow: var(--shadow-pop);
     }
-    /* Older names kept for components that still use them */
-    .shadow-soft {
-        box-shadow: var(--shadow-float);
-    }
-    .shadow-dialog {
-        box-shadow: var(--shadow-pop);
-    }
 }
 
 @keyframes fadeIn {
@@ -284,17 +275,13 @@
     }
 }
 
-@keyframes check-pop {
-    0% {
-        transform: scale(0.8);
-        opacity: 0;
+/* A highlight sweeps across "Thinking..." text (Shimmer) */
+@keyframes shimmer {
+    from {
+        background-position: 100% center;
     }
-    50% {
-        transform: scale(1.1);
-    }
-    100% {
-        transform: scale(1);
-        opacity: 1;
+    to {
+        background-position: 0% center;
     }
 }
 
@@ -307,15 +294,15 @@
 .animate-panel-in {
     animation: panelIn 0.32s var(--ease-out) both;
 }
-.animate-check-pop {
-    animation: check-pop 0.25s var(--ease-spring) forwards;
+.animate-shimmer {
+    animation: shimmer var(--shimmer-duration, 2s) linear infinite;
 }
 
 @media (prefers-reduced-motion: reduce) {
     .animate-fade-in,
     .animate-message-in,
     .animate-panel-in,
-    .animate-check-pop {
+    .animate-shimmer {
         animation: none;
     }
 }