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",

src/renderer/views/SidebarView.tsx

@@ -86,20 +86,20 @@ export function SidebarView({
                       <div key={company.id} className="group flex items-center">
                         {confirmDeleteCompanyId === company.id ? (
                           <div className="flex w-full items-center gap-2 px-3 py-2">
-                            <span className="flex-1 truncate text-[12px] text-destructive">Delete {company.name}?</span>
+                            <span className="flex-1 truncate text-[12px] text-destructive">{t("sidebar.deleteCompanyConfirm", `Delete ${company.name}?`).replace("{name}", company.name)}</span>
                             <button
                               type="button"
                               className="rounded px-2 py-0.5 text-[11px] font-semibold text-destructive transition hover:bg-destructive hover:text-primary-foreground"
                               onClick={() => void deleteCompany(company.id)}
                             >
-                              Yes
+                              {t("common.yes")}
                             </button>
                             <button
                               type="button"
                               className="rounded px-2 py-0.5 text-[11px] font-semibold text-muted-foreground transition hover:bg-muted"
                               onClick={() => setConfirmDeleteCompanyId(null)}
                             >
-                              No
+                              {t("common.no")}
                             </button>
                           </div>
                         ) : (