tui: add session rename functionality with /rename command

- Add /rename command to autocomplete when a session is active
- Add rename dialog component for changing session names
- Add rename option to session list dialog with 'r' keybind
- Add session rename command to command registry

packages/opencode/src/cli/cmd/tui/routes/session/index.tsx

@@ -63,6 +63,7 @@ import { Sidebar } from "./sidebar"
 import { LANGUAGE_EXTENSIONS } from "@/lsp/language"
 import parsers from "../../../../../../parsers-config.ts"
 import { Toast } from "../../ui/toast"
+import { DialogSessionRename } from "../../component/dialog-session-rename"
 
 addDefaultParsers(parsers.parsers)
 
@@ -370,6 +371,15 @@ export function Session() {
         dialog.clear()
       },
     },
+    {
+      title: "Rename session",
+      value: "session.rename",
+      keybind: "session_rename",
+      category: "Session",
+      onSelect: (dialog) => {
+        dialog.replace(() => <DialogSessionRename session={route.sessionID} />)
+      },
+    },
   ])
 
   const revert = createMemo(() => {