feat(i18n): add multi-language support (ja/ko/vi/ru/zh-TW) with system auto-detection

- Extend AppLanguage to 7 locales: zh-CN, zh-TW, en, ja, ko, vi, ru
- Auto-detect system language via navigator.languages; fallback to English
- Add BCP47 locale mapping for date formatting and sorting
- Create 50 translation JSON files (5 languages × 10 namespaces, 1137 keys each)
- Update language selector with native language names
- Extend locale key parity test to cover all 7 languages (70 assertions)
- Add VNC/RDP desktop, serial terminal, AI agent, port forwarding, and SFTP features
- Add credential encryption, host metrics, session backup crypto, and zmodem bridge
- Update Rust backend: desktop services, host metrics, SSH/SFTP enhancements

test/utils/snippetVariables.test.ts

@@ -1,6 +1,11 @@
 import { describe, it, expect } from 'vitest'
 import { expandSnippetVariables } from '../../src/utils/snippetVariables'
 import { applyKeywordHighlights, DEFAULT_KEYWORD_HIGHLIGHT_RULES } from '../../src/utils/keywordHighlight'
+import {
+  StreamingKeywordHighlight,
+  trailingIncompleteEscape,
+} from '../../src/utils/streamingKeywordHighlight'
+import { localShellEnterKey, normalizeTerminalInject } from '../../src/utils/platformShells'
 
 describe('expandSnippetVariables', () => {
   it('replaces known placeholders', () => {
@@ -35,4 +40,87 @@ describe('applyKeywordHighlights', () => {
     const text = 'no highlight'
     expect(applyKeywordHighlights(text, rules)).toBe(text)
   })
+
+  it('does not inject SGR inside OSC window-title sequences (SSH title leak)', () => {
+    const rules = [
+      {
+        id: 'ipv4',
+        label: 'IPv4',
+        pattern: '\\b(?:\\d{1,3}\\.){3}\\d{1,3}\\b',
+        isRegex: true,
+        color: '#8be9fd',
+        enabled: true,
+      },
+    ]
+    const osc = '\x1b]0;ssh root@165.154.155.48\x07'
+    const out = applyKeywordHighlights(`${osc}Welcome to Ubuntu`, rules)
+    expect(out).toContain(osc)
+    expect(out).not.toMatch(/\x1b\]0;.*\x1b\[38/)
+    expect(out).toContain('Welcome to Ubuntu')
+  })
+
+  it('still highlights IPs in plain text when the ipv4 rule is enabled', () => {
+    const rules = [
+      {
+        id: 'ipv4',
+        label: 'IPv4',
+        pattern: '\\b(?:\\d{1,3}\\.){3}\\d{1,3}\\b',
+        isRegex: true,
+        color: '#8be9fd',
+        enabled: true,
+      },
+    ]
+    const out = applyKeywordHighlights('peer 10.0.0.1 online', rules)
+    expect(out).toContain('\x1b[38;2;')
+    expect(out).toContain('10.0.0.1')
+    expect(out).toContain('\x1b[39m')
+  })
+
+  it('leaves existing CSI color sequences intact', () => {
+    const colored = '\x1b[01;32mroot\x1b[00m@host'
+    const out = applyKeywordHighlights(colored, DEFAULT_KEYWORD_HIGHLIGHT_RULES)
+    expect(out).toContain('\x1b[01;32mroot\x1b[00m')
+  })
+})
+
+describe('StreamingKeywordHighlight', () => {
+  const ipv4Rules = [
+    {
+      id: 'ipv4',
+      label: 'IPv4',
+      pattern: '\\b(?:\\d{1,3}\\.){3}\\d{1,3}\\b',
+      isRegex: true,
+      color: '#8be9fd',
+      enabled: true,
+    },
+  ]
+
+  it('holds incomplete OSC across chunks', () => {
+    expect(trailingIncompleteEscape('\x1b]0;ssh root@1.2.3.4')).toBe('\x1b]0;ssh root@1.2.3.4')
+    const stream = new StreamingKeywordHighlight()
+    expect(stream.push('\x1b]0;ssh root@1.2.3.4', ipv4Rules)).toBe('')
+    const done = stream.push('\x07Welcome', ipv4Rules)
+    expect(done).toContain('\x1b]0;ssh root@1.2.3.4\x07')
+    expect(done).toContain('Welcome')
+    expect(done).not.toMatch(/\x1b\]0;.*\x1b\[38/)
+  })
+
+  it('holds incomplete CSI across chunks', () => {
+    const stream = new StreamingKeywordHighlight()
+    expect(stream.push('\x1b[38;2;139', ipv4Rules)).toBe('')
+    const out = stream.push(';233;253m10.0.0.1 done', ipv4Rules)
+    expect(out.startsWith('\x1b[38;2;139;233;253m')).toBe(true)
+  })
+})
+
+describe('normalizeTerminalInject', () => {
+  it('converts LF to CR like xterm paste', () => {
+    expect(normalizeTerminalInject('echo hi\n', '')).toBe('echo hi\r')
+    expect(normalizeTerminalInject('echo hi', '\r')).toBe('echo hi\r')
+  })
+
+  it('uses CR enter for unix local shells', () => {
+    expect(localShellEnterKey('zsh')).toBe('\r')
+    expect(localShellEnterKey('pwsh')).toBe('\r\n')
+  })
 })