feat: add Chinese (Simplified) language support

[GTLOLI]

Summary

Add Chinese (Simplified) language support for Tabularis.

Changes

• Add zh.json translation file with complete Chinese translations
• Register Chinese in i18n config.ts
• Add language option in settings UI (alongside English, Italian, Spanish)

Motivation

Chinese is widely used globally. Adding Chinese localization will make Tabularis accessible to more users.

Testing

All translation keys have been verified against the English source file structure.

[kilo-code-bot]

Code Review Summary

Status: 3 Issues Found | Recommendation: Address before merge

Overview

Severity	Count
CRITICAL	0
WARNING	2
SUGGESTION	1

Issue Details (click to expand)

WARNING

File	Line	Issue
src/contexts/SettingsContext.ts	3	Missing 'zh' in AppLanguage type - The type is defined as `"auto"
src/pages/Settings.tsx	1011-1016	Missing Chinese in language selector - The availableLanguages array doesn't include { id: "zh", label: t("settings.chinese") }, so users cannot select Chinese from the settings UI

SUGGESTION

File	Line	Issue
src/i18n/locales/zh.json	213-215	Missing 'chinese' translation key - Should add "chinese": "中文" to the settings section for consistency with other locale files (en.json has "chinese": "Chinese" pattern)

Other Observations (not in diff)

The PR adds the Chinese locale file and i18n configuration correctly, but the language cannot be selected in the UI because:

1. AppLanguage type doesn't include "zh"
2. Settings page language dropdown doesn't list Chinese as an option

These files need to be updated to complete the localization feature.

Files Reviewed (2 files)

• src/i18n/config.ts - Import and registration look correct
• src/i18n/locales/zh.json - Comprehensive translation file (879 lines), follows same structure as other locales

Fix these issues in Kilo Cloud

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_{Reviewed by kimi-k2.5-0127 · 417,931 tokens}

[debba]

LGTM, I will merge it.
Feel free to share in chinese socials :)

[debba]

@GTLOLI needed to change some stuffs, and I cannot review the language (i am italian)
Btw I added a thank to you in https://tabularis.dev/blog/v0911-chinese-postgres-arrays-inline-editing