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

lib/admin/providers.ts

@@ -56,7 +56,7 @@ const StoredAdminProviderSchema = AdminProviderSchema.extend({
     vertexApiKey: z.string().optional(),
 })
 
-type AdminProviderInput = z.infer<typeof AdminProviderSchema>
+export type AdminProviderInput = z.infer<typeof AdminProviderSchema>
 
 // Stored form: secrets are plain strings
 export interface StoredAdminProvider {

lib/admin/settings-registry.ts

@@ -10,7 +10,7 @@
 // - ADMIN_PASSWORD / SETTINGS_FILE: bootstrap values, env-only to avoid lockout
 // - Per-provider reasoning/thinking tuning vars: env-only (see env.example)
 
-export type SettingType = "string" | "secret" | "number" | "boolean" | "enum"
+export type SettingType = "string" | "secret" | "number" | "boolean"
 
 export interface SettingDef {
     key: string
@@ -18,7 +18,6 @@ export interface SettingDef {
     type: SettingType
     label: string
     description?: string
-    options?: string[]
     min?: number
     max?: number
     placeholder?: string
@@ -123,13 +122,6 @@ export const SETTINGS_REGISTRY: SettingDef[] = [
         label: "Validation Timeout (ms)",
         min: 1000,
     },
-    {
-        key: "ENABLE_HISTORY_XML_REPLACE",
-        group: "features",
-        type: "boolean",
-        label: "History XML Compression",
-        description: "Replace old diagram XML in history with placeholders.",
-    },
     {
         key: "ALLOW_PRIVATE_URLS",
         group: "features",