fix(github): keep merged PRs as branch history instead of hiding them

Branch status resolves an open PR across the whole fork network first, so a
merged fork PR can never hide an open upstream PR for the same head. Only when
no target has an open PR does the branch's newest closed/merged PR come back,
as history.

The panel shows that history as a compact note and offers creating the next PR
below it, instead of either sticking on a terminal PR or going blank after a
merge. Terminal associations stay persisted for reload continuity but are never
treated as authority: they revalidate on the discovery cadence and on focus.

History is looked up only for the branch's own remote and name, and remembered
per repo+branch, so the extra lookup cannot exhaust the route's resolve budget.
The checks summary and merge-permission lookup are skipped for a closed or
merged PR, where neither is actionable.

packages/ui/src/lib/i18n/messages/de.ts

@@ -933,6 +933,8 @@ export const dict = {
   'gitView.pr.field.draft': 'Entwurf',
   'gitView.pr.field.title': 'Titel',
   'gitView.pr.githubNotConnected': 'GitHub ist nicht verbunden',
+  'gitView.pr.history.merged': 'PR #{number} wurde in {base} gemergt.',
+  'gitView.pr.history.closed': 'PR #{number} wurde geschlossen.',
   'gitView.pr.loadingDescription': 'Beschreibung wird geladen...',
   'gitView.pr.mergeMethod.merge': 'Einen Merge-Commit erstellen',
   'gitView.pr.mergeMethod.rebase': 'Rebase und Merge',

packages/ui/src/lib/i18n/messages/en.ts

@@ -997,6 +997,8 @@ export const dict = {
   'gitView.pr.field.draft': 'Draft',
   'gitView.pr.field.title': 'Title',
   'gitView.pr.githubNotConnected': 'GitHub is not connected',
+  'gitView.pr.history.merged': 'PR #{number} was merged into {base}.',
+  'gitView.pr.history.closed': 'PR #{number} was closed.',
   'gitView.pr.loadingDescription': 'Loading description...',
   'gitView.pr.mergeMethod.merge': 'Create a merge commit',
   'gitView.pr.mergeMethod.rebase': 'Rebase and merge',

packages/ui/src/lib/i18n/messages/es.ts

@@ -998,6 +998,8 @@ export const dict: Record<I18nKey, string> = {
   "gitView.pr.field.draft": "Borrador",
   "gitView.pr.field.title": "Título",
   "gitView.pr.githubNotConnected": "GitHub no está conectado",
+  "gitView.pr.history.merged": "La PR #{number} se fusionó en {base}.",
+  "gitView.pr.history.closed": "La PR #{number} se cerró.",
   "gitView.pr.loadingDescription": "Cargando descripción...",
   "gitView.pr.mergeMethod.merge": "Crear un merge commit",
   "gitView.pr.mergeMethod.rebase": "Rebase y merge",

packages/ui/src/lib/i18n/messages/fr.ts

@@ -817,6 +817,8 @@ export const dict = {
   'gitView.pr.field.draft': 'Brouillon',
   'gitView.pr.field.title': 'Titre',
   'gitView.pr.githubNotConnected': 'GitHub n\'est pas connecté',
+  'gitView.pr.history.merged': 'La PR #{number} a été fusionnée dans {base}.',
+  'gitView.pr.history.closed': 'La PR #{number} a été fermée.',
   'gitView.pr.loadingDescription': 'Chargement de la description de la PR...',
   'gitView.pr.mergeMethod.merge': 'Créer un commit de fusion',
   'gitView.pr.mergeMethod.rebase': 'Rebase et fusionner',

packages/ui/src/lib/i18n/messages/ja.ts

@@ -994,6 +994,8 @@ export const dict: Record<I18nKey, string> = {
   'gitView.pr.field.draft': '下書き',
   'gitView.pr.field.title': 'タイトル',
   'gitView.pr.githubNotConnected': 'GitHubが接続されていません',
+  'gitView.pr.history.merged': 'PR #{number} は {base} にマージされました。',
+  'gitView.pr.history.closed': 'PR #{number} はクローズされました。',
   'gitView.pr.loadingDescription': '説明を読み込み中...',
   'gitView.pr.mergeMethod.merge': 'マージコミットを作成',
   'gitView.pr.mergeMethod.rebase': 'リベースしてマージ',

packages/ui/src/lib/i18n/messages/ko.ts

@@ -998,6 +998,8 @@ export const dict: Record<I18nKey, string> = {
   'gitView.pr.field.draft': '드래프트',
   'gitView.pr.field.title': '제목',
   'gitView.pr.githubNotConnected': 'GitHub에 연결되지 않음',
+  'gitView.pr.history.merged': 'PR #{number}이(가) {base}에 병합되었습니다.',
+  'gitView.pr.history.closed': 'PR #{number}이(가) 닫혔습니다.',
   'gitView.pr.loadingDescription': '설명 로드 중…',
   'gitView.pr.mergeMethod.merge': '병합 커밋 생성',
   'gitView.pr.mergeMethod.rebase': '리베이스 후 병합',

packages/ui/src/lib/i18n/messages/pl.ts

@@ -2187,6 +2187,8 @@ export const dict: Record<I18nKey, string> = {
   'gitView.pr.field.draft': 'Szkic',
   'gitView.pr.field.title': 'Tytuł',
   'gitView.pr.githubNotConnected': 'GitHub nie jest połączony',
+  'gitView.pr.history.merged': 'PR #{number} został scalony do {base}.',
+  'gitView.pr.history.closed': 'PR #{number} został zamknięty.',
   'gitView.pr.loadingDescription': 'Loading description...',
   'gitView.pr.mergeMethod.merge': 'Create a merge commit',
   'gitView.pr.mergeMethod.rebase': 'Rebase and merge',

packages/ui/src/lib/i18n/messages/pt-BR.ts

@@ -998,6 +998,8 @@ export const dict: Record<I18nKey, string> = {
   "gitView.pr.field.draft": "Borrador",
   "gitView.pr.field.title": "Título",
   "gitView.pr.githubNotConnected": "GitHub não está conectado",
+  "gitView.pr.history.merged": "A PR #{number} foi mesclada em {base}.",
+  "gitView.pr.history.closed": "A PR #{number} foi fechada.",
   "gitView.pr.loadingDescription": "Carregando descrição...",
   "gitView.pr.mergeMethod.merge": "Criar um merge commit",
   "gitView.pr.mergeMethod.rebase": "Rebase e merge",

packages/ui/src/lib/i18n/messages/uk.ts

@@ -998,6 +998,8 @@ export const dict: Record<I18nKey, string> = {
   "gitView.pr.field.draft": "Чернетка",
   "gitView.pr.field.title": "Назва",
   "gitView.pr.githubNotConnected": "GitHub не підключено",
+  "gitView.pr.history.merged": "PR #{number} злито в {base}.",
+  "gitView.pr.history.closed": "PR #{number} закрито.",
   "gitView.pr.loadingDescription": "Завантаження опису...",
   "gitView.pr.mergeMethod.merge": "Створити коміт злиття",
   "gitView.pr.mergeMethod.rebase": "Перебазувати та злити",

packages/ui/src/lib/i18n/messages/zh-CN.ts

@@ -998,6 +998,8 @@ export const dict: Record<I18nKey, string> = {
   'gitView.pr.field.draft': '草稿',
   'gitView.pr.field.title': '标题',
   'gitView.pr.githubNotConnected': 'GitHub 未连接',
+  'gitView.pr.history.merged': 'PR #{number} 已合并到 {base}。',
+  'gitView.pr.history.closed': 'PR #{number} 已关闭。',
   'gitView.pr.loadingDescription': '正在加载描述...',
   'gitView.pr.mergeMethod.merge': '创建合并提交',
   'gitView.pr.mergeMethod.rebase': '变基并合并',

packages/ui/src/lib/i18n/messages/zh-TW.ts

@@ -1010,6 +1010,8 @@ export const dict: Record<I18nKey, string> = {
   'gitView.pr.field.draft': '草稿',
   'gitView.pr.field.title': '標題',
   'gitView.pr.githubNotConnected': 'GitHub 未連線',
+  'gitView.pr.history.merged': 'PR #{number} 已合併到 {base}。',
+  'gitView.pr.history.closed': 'PR #{number} 已關閉。',
   'gitView.pr.loadingDescription': '正在載入描述...',
   'gitView.pr.mergeMethod.merge': '建立合併提交',
   'gitView.pr.mergeMethod.rebase': 'Rebase 並合併',