fix: unify speaker name ushironoko → うしろのこ (#815)

* fix: unify speaker name ushironoko to うしろのこ

2022/2023 used うしろのこ while 2026 used ushironoko, so DirectoryView
treated them as separate speakers. Normalize the display name to うしろのこ.

Co-authored-by: Oyama Michinoku <0910yama@gmail.com>

* test: assert うしろのこ and ushironoko stay unified

Guard against reintroducing a separate ushironoko speaker entry
that would split DirectoryView aggregation again.

Co-authored-by: Oyama Michinoku <0910yama@gmail.com>

* chore: remove regression test for うしろのこ name unification

Co-authored-by: Oyama Michinoku <0910yama@gmail.com>

* feat: add English name ushironoko for うしろのこ

Set nameEn to ushironoko across 2022, 2023 panel entries and the 2026
solo talk so English mode shows the expected handle.

Co-authored-by: Oyama Michinoku <0910yama@gmail.com>

---------

Co-authored-by: Cursor Agent <cursoragent@cursor.com>

Author: yamanoku

src/data/speakers-2022.ts

@@ -126,6 +126,7 @@ export const speakers2022: SpeakerInfo[] = [
   },
   {
     name: ["miyaoka", "うしろのこ", "takanorip", "やまのく", "kazupon"],
+    nameEn: ["miyaoka", "ushironoko", "takanorip", "やまのく", "kazupon"],
     title: "なるほどVueコンポーネント",
     url: "https://vuefes.jp/2022/#naruhodo-vue-component",
     format: "panel",

src/data/speakers-2023.ts

@@ -154,6 +154,7 @@ export const speakers2023: SpeakerInfo[] = [
   },
   {
     name: ["takanorip", "miyaoka", "wattanx", "やまのく", "うしろのこ", "kazupon"],
+    nameEn: ["takanorip", "miyaoka", "wattanx", "やまのく", "ushironoko", "kazupon"],
     title: "なぜVueを選んだのか？",
     url: "https://vuefes.jp/2023/#events-panel",
     format: "panel",

src/data/speakers-2026.ts

@@ -82,7 +82,8 @@ export const speakers2026: SpeakerInfo[] = [
     url: "https://vuefes.jp/2026/speaker/hiranuma",
   },
   {
-    name: ["ushironoko"],
+    name: ["うしろのこ"],
+    nameEn: ["ushironoko"],
     title: "型なし、テストなし、1万行のドメインロジックがあるVuexをPiniaへ移行する",
     url: "https://vuefes.jp/2026/speaker/ushironoko",
   },