Fix: three incorrect code examples in the guide

[StanislavKozachenko]

Description of Problem

Three errors in code examples across the guide — see issue #3417 for full context.

1. guide/essentials/reactivity-fundamentals — Stateful Methods

The solution block uses _.debounce(this.click, 500), but _ is never imported. The preceding block in the same section already has import { debounce } from 'lodash-es', so calling _.debounce results in a ReferenceError at runtime.

2. guide/components/events — Declaring Emitted Events, Options API

The Options API emits object syntax example contains TypeScript type annotations but is fenced as js. The Composition API counterpart directly above it correctly uses <script setup lang="ts">.

3. guide/components/v-model — Modifiers for v-model with Arguments, Options API

The tag <MyComponent v-model:title.capitalize="myText"> is missing the self-closing />. All other component tags on the page use />.

Proposed Solution

• reactivity-fundamentals.md: replace _.debounce with debounce
• events.md: change code fence from js to ts
• v-model.md: add /> to close the component tag

Additional Information

Closes #3417

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