feat(tui): use canonical prompt attachments

packages/tui/src/routes/home.tsx

@@ -51,7 +51,7 @@ export function Home() {
       return
     }
     if (!args.prompt) return
-    r.set({ input: args.prompt, parts: [] })
+    r.set({ text: args.prompt, files: [], agents: [], pasted: [] })
     once = true
   }
 
@@ -62,7 +62,7 @@ export function Home() {
     if (!r) return
     if (!sync.ready || !local.model.ready) return
     if (!args.prompt) return
-    if (r.current.input !== args.prompt) return
+    if (r.current.text !== args.prompt) return
     sent = true
     r.submit()
   })

packages/tui/src/routes/session/dialog-fork-from-timeline.tsx

@@ -6,8 +6,7 @@ import { Locale } from "../../util/locale"
 import { useSDK } from "../../context/sdk"
 import { useRoute } from "../../context/route"
 import { useDialog, type DialogContext } from "../../ui/dialog"
-import type { PromptInfo } from "../../component/prompt/history"
-import { stripPromptPartIDs as strip } from "../../prompt/part"
+import { emptyPrompt, type PromptInfo } from "../../component/prompt/history"
 
 export function DialogForkFromTimeline(props: { sessionID: string; onMove: (messageID?: string) => void }) {
   const sync = useSync()
@@ -53,12 +52,25 @@ export function DialogForkFromTimeline(props: { sessionID: string; onMove: (mess
           const prompt = parts.reduce(
             (agg, part) => {
               if (part.type === "text") {
-                if (!part.synthetic) agg.input += part.text
+                if (!part.synthetic) agg.text += part.text
+              }
+              if (part.type === "file") {
+                const files = (agg.files ??= [])
+                files.push({
+                  uri: part.url,
+                  name: part.filename,
+                  source: part.source?.text
+                    ? {
+                        start: part.source.text.start,
+                        end: part.source.text.end,
+                        text: part.source.text.value,
+                      }
+                    : undefined,
+                })
               }
-              if (part.type === "file") agg.parts.push(strip(part))
               return agg
             },
-            { input: "", parts: [] as PromptInfo["parts"] },
+            emptyPrompt() as PromptInfo,
           )
           route.navigate({
             sessionID: forked.data!.id,

packages/tui/src/routes/session/index.tsx

@@ -1420,11 +1420,11 @@ function UserMessage(props: { message: SessionMessageUser }) {
             <box flexDirection="row" paddingBottom={metadataVisible() ? 1 : 0} paddingTop={1} gap={1} flexWrap="wrap">
               <For each={files()}>
                 {(file) => {
-                  const directory = file.mime === "application/x-directory"
+                  const label = file.mime === "application/x-directory" ? "Directory" : file.mime
                   return (
                     <text fg={theme.text}>
                       <span style={{ bg: theme.secondary, fg: theme.background }}>
-                        {directory ? " Directory " : " File "}
+                        {` ${label} `}
                       </span>
                       <span style={{ bg: theme.backgroundElement, fg: theme.textMuted }}>
                         {" "}