i18n(sidebar): localise company delete confirmation + Yes/No buttons (P3-48)

Delete-company confirmation text now uses sidebar.deleteCompanyConfirm key
with {name} placeholder; Yes/No buttons route through common.yes/no.

src/renderer/i18n/en.ts

@@ -257,6 +257,7 @@ export const en: Record<string, string> = {
   "common.close": "Close",
   "common.yes": "Yes",
   "common.no": "No",
+  "sidebar.deleteCompanyConfirm": "Delete {name}?",
   "common.confirm": "Confirm",
   "common.status": "Status",
   "common.started": "Started",

src/renderer/i18n/zh.ts

@@ -257,6 +257,7 @@ export const zh: Record<string, string> = {
   "common.close": "关闭",
   "common.yes": "是",
   "common.no": "否",
+  "sidebar.deleteCompanyConfirm": "删除{name}？",
   "common.confirm": "确认",
   "common.status": "状态",
   "common.started": "开始时间",