feat(sessions): add session browsing for Gemini CLI

src/i18n/locales/en.json

@@ -515,7 +515,7 @@
   },
   "sessionManager": {
     "title": "Session Manager",
-    "subtitle": "Manage Claude Code, Codex, OpenCode and OpenClaw sessions",
+    "subtitle": "Manage Claude Code, Codex, OpenCode, OpenClaw and Gemini CLI sessions",
     "searchPlaceholder": "Search by content, directory, or ID",
     "searchSessions": "Search sessions",
     "providerFilterAll": "All",

src/i18n/locales/ja.json

@@ -515,7 +515,7 @@
   },
   "sessionManager": {
     "title": "セッション管理",
-    "subtitle": "Claude Code / Codex / OpenCode / OpenClaw のセッションを管理",
+    "subtitle": "Claude Code / Codex / OpenCode / OpenClaw / Gemini CLI のセッションを管理",
     "searchPlaceholder": "内容・ディレクトリ・ID で検索",
     "searchSessions": "セッションを検索",
     "providerFilterAll": "すべて",

src/i18n/locales/zh.json

@@ -515,7 +515,7 @@
   },
   "sessionManager": {
     "title": "会话管理",
-    "subtitle": "管理 Claude Code、Codex、OpenCode 与 OpenClaw 会话记录",
+    "subtitle": "管理 Claude Code、Codex、OpenCode、OpenClaw 与 Gemini CLI 会话记录",
     "searchPlaceholder": "搜索会话内容、目录或 ID",
     "searchSessions": "搜索会话",
     "providerFilterAll": "全部",