refactor(popup): 5종 팝업 _i18n 주입 + 색상 토큰화 (WS-POPUP)

- 4종 팝업(command/history/result/recording-tip) _i18n 주입:
  WindowManager getPopupI18nStrings() + 팝업 script applyI18nToHtml()
- 한국어/영어 하드코딩 -> popup.* i18n 키 (ko/en 17키)
- theme-vars.ts에 --d3-wave-1~9, --d3-status-error/success 토큰 추가 (6 테마)
- 팝업 style.css hex -> CSS var 토큰
- packages/i18n getI18n() (main 프로세스용) 추가
SKIP: caption-overlay _i18n(별도 IPC 구조), wave box-shadow 보간(opacity 단순화)
정책: docs/REFACTOR_POLICY.md DP3, 이식 인사이트 P5

packages/i18n/src/locales/en.json

@@ -553,5 +553,23 @@
   "onboarding.sttModelSize": "Size: ~1.6GB — takes 2–10 min depending on network speed",
   "onboarding.step": "Step {{current}}/{{total}}",
   "onboarding.progressDetail": "{{downloaded}} / {{total}} MB",
-  "onboarding.ollamaNotRunning": "Ollama server is not running. Please retry shortly."
+  "onboarding.ollamaNotRunning": "Ollama server is not running. Please retry shortly.",
+
+  "popup.commandSelect": "COMMAND SELECT",
+  "popup.hints.select": "↑↓ Select",
+  "popup.hints.apply": "⏎ Apply",
+  "popup.hints.clear": "0 Clear",
+  "popup.hints.close": "ESC ×",
+  "popup.noCommands": "No commands",
+  "popup.noCommand": "No command (insert original)",
+  "popup.hints.selectEn": "↑↓ Select",
+  "popup.hints.paste": "⏎ Paste",
+  "popup.noHistory": "No history yet",
+  "popup.time.justNow": "just now",
+  "popup.time.minutesAgo": "{{m}}m ago",
+  "popup.time.hoursAgo": "{{h}}h ago",
+  "popup.time.daysAgo": "{{d}}d ago",
+  "popup.copy": "Copy",
+  "popup.error.default": "An error occurred",
+  "popup.caption.loading": "⏳ Loading STT model..."
 }