feat(tui): add fuzzy search to model picker

- Add SearchableSelectList component with fuzzy filtering
- Integrate with /models command for quick model search
- Support up/down navigation while typing
- Uses pi-tui's fuzzyFilter for intelligent matching

src/tui/tui-command-handlers.ts

@@ -7,7 +7,7 @@ import {
 import { normalizeAgentId } from "../routing/session-key.js";
 import { helpText, parseCommand } from "./commands.js";
 import type { ChatLog } from "./components/chat-log.js";
-import { createSelectList, createSettingsList } from "./components/selectors.js";
+import { createSearchableSelectList, createSelectList, createSettingsList } from "./components/selectors.js";
 import type { GatewayChatClient } from "./gateway-chat.js";
 import { formatStatusSummary } from "./tui-status-summary.js";
 import type {
@@ -72,7 +72,7 @@ export function createCommandHandlers(context: CommandHandlerContext) {
         label: `${model.provider}/${model.id}`,
         description: model.name && model.name !== model.id ? model.name : "",
       }));
-      const selector = createSelectList(items, 9);
+      const selector = createSearchableSelectList(items, 9);
       selector.onSelect = (item) => {
         void (async () => {
           try {