fix(XSender): upgrade x-sender to 1.4.3 to fix IME input bugs

[stevenwangking]

🐛 Bug Fix

Upgrade x-sender from 1.3.3 to 1.4.3 to fix critical IME (Input Method Editor) bugs that affect Chinese/Japanese/Korean users.

🔗 Related Issues

• #488 — iOS 无法输入中文
• x-sender#45 — iOS 简体拼音快速输入导致输入框卡死
• x-sender#44 — 中文输入法输出字母

📝 Problem Description

x-sender@1.3.3 does not handle compositionstart / compositionUpdate / compositionend events, causing:

1. Chinese IME outputs latin letters — Pinyin letters are inserted as real text before word selection is confirmed
2. iOS cannot input Chinese — After selecting a candidate word, no text appears in the input box
3. iOS pinyin fast input freeze — Rapid typing triggers internal state errors, freezing the input completely

The fix (compositionUpdate handling) was introduced in x-sender@1.3.9. This PR upgrades to 1.4.3 (latest stable).

📋 Changes

• packages/core/package.json: x-sender ^1.3.3 → ^1.4.3
• pnpm-lock.yaml: updated accordingly

✅ API Compatibility

Verified that the API changes between 1.3.3 and 1.4.3 do NOT affect Element-Plus-X:

Change	Type	Used in EPX?
backspace?: boolean added to TipConfig	Non-breaking (optional)	-
EVENT_COMMON_SELECT_ACTIVE → EVENT_COMMON_TAG_CLICK	Breaking (internal event key)	No
EVENT_COMMON_TAG_CLICK new export	Non-breaking (new)	No

Element-Plus-X only imports XSender default export and types (MentionConfig, TriggerConfig, SelectConfig, TipConfig, TagData, etc.) — none of which are affected.

🧪 Verification

• Diffed npm tarball of x-sender@1.3.3 vs 1.4.3: only XSender.mjs changed (CSS and type declarations nearly identical)
• Built vue-element-plus-x with new version: all components identical except dist/es/XSender/index.js (expected)
• No TypeScript errors

📝 变更类型

• 🐛 fix: 修复缺陷

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