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

components/provider-credentials-fields.tsx

@@ -58,9 +58,6 @@ interface ProviderCredentialsFieldsProps {
     name?: string
     baseUrl?: string
     awsRegion?: string
-    // Bedrock: also offer an API key (the user dialog; the admin panel
-    // stores access keys only)
-    bedrockApiKey?: boolean
     disabled?: boolean
     // Update a plain text field
     onChange: (field: "name" | "baseUrl" | "awsRegion", value: string) => void
@@ -68,9 +65,6 @@ interface ProviderCredentialsFieldsProps {
     // UI (e.g. the user dialog's inline Test button + validation error); the
     // shared component only supplies the label above it.
     renderSecret: (opts: { field: SecretField; id: string }) => ReactNode
-    // Extra content after the fields — used for the Bedrock test row and the
-    // EdgeOne test button, which aren't beside a credential input.
-    footer?: ReactNode
     // The user's settings page: the secrets come first, the display name and
     // base URL fold under "More options", and Bedrock shows only the way of
     // signing in that is chosen. Switching it empties the other way's
@@ -91,11 +85,9 @@ export function ProviderCredentialsFields({
     name,
     baseUrl,
     awsRegion,
-    bedrockApiKey,
     disabled,
     onChange,
     renderSecret,
-    footer,
     settingsLayout,
     clearSecrets,
     bedrockFilled,
@@ -269,10 +261,8 @@ export function ProviderCredentialsFields({
         </div>
     )
 
-    // EdgeOne needs no credentials — the caller supplies just a test button
-    if (provider === "edgeone") {
-        return <div className="space-y-5">{footer}</div>
-    }
+    // EdgeOne needs no credentials
+    if (provider === "edgeone") return null
 
     if (settingsLayout) {
         return (
@@ -447,7 +437,6 @@ export function ProviderCredentialsFields({
                         </>
                     )}
                 </div>
-                {footer}
             </div>
         )
     }
@@ -458,26 +447,6 @@ export function ProviderCredentialsFields({
 
             {provider === "bedrock" ? (
                 <>
-                    {/* Bedrock API key: used instead of the access keys */}
-                    {bedrockApiKey && (
-                        <div className="space-y-2">
-                            <Label
-                                htmlFor="bedrock-api-key"
-                                className="text-xs font-medium flex items-center gap-1.5"
-                            >
-                                <Key className="h-3.5 w-3.5 text-muted-foreground" />
-                                {dict.modelConfig.bedrockApiKey}
-                            </Label>
-                            {renderSecret({
-                                field: "apiKey",
-                                id: "bedrock-api-key",
-                            })}
-                            <p className="text-xs text-muted-foreground">
-                                {dict.modelConfig.bedrockApiKeyHint}
-                            </p>
-                        </div>
-                    )}
-
                     {/* AWS Access Key ID */}
                     <div className="space-y-2">
                         <Label
@@ -535,8 +504,6 @@ export function ProviderCredentialsFields({
                     {baseUrlField}
                 </>
             )}
-
-            {footer}
         </div>
     )
 }