Added copy option to message context menu (#4389)

Co-authored-by: opencode-agent[bot] <opencode-agent[bot]@users.noreply.github.com>
Co-authored-by: rekram1-node <rekram1-node@users.noreply.github.com>
Co-authored-by: GitHub Action <action@github.com>

packages/opencode/src/cli/cmd/tui/routes/session/dialog-message.tsx

@@ -3,6 +3,7 @@ import { useSync } from "@tui/context/sync"
 import { DialogSelect } from "@tui/ui/dialog-select"
 import { useSDK } from "@tui/context/sdk"
 import { useRoute } from "@tui/context/route"
+import { Clipboard } from "@tui/util/clipboard"
 import type { PromptInfo } from "@tui/component/prompt/history"
 
 export function DialogMessage(props: {
@@ -54,6 +55,26 @@ export function DialogMessage(props: {
             dialog.clear()
           },
         },
+        {
+          title: "Copy",
+          value: "message.copy",
+          description: "copy message text to clipboard",
+          onSelect: async (dialog) => {
+            const msg = message()
+            if (!msg) return
+
+            const parts = sync.data.part[msg.id]
+            const text = parts.reduce((agg, part) => {
+              if (part.type === "text" && !part.synthetic) {
+                agg += part.text
+              }
+              return agg
+            }, "")
+
+            await Clipboard.copy(text)
+            dialog.clear()
+          },
+        },
         {
           title: "Fork",
           value: "session.fork",