feat(tui): dedup agent/model trailer on last message

CHANGELOG.md

@@ -9,6 +9,14 @@ file is the human-readable summary of what changed and why.
 
 ### TUI
 
+- **No more duplicated agent · model line** — the trailer under the last
+  assistant reply (`▣ Build · MiniMax/MiniMax-M2.7 · 3m`) used to repeat the
+  agent and model the prompt footer already shows one line below. When they
+  match the current selection, the `▣` marker and the agent/model text are now
+  hidden and only the elapsed time remains, shown as `Baked for 3m`. Older
+  messages in the transcript, and the last message after you switch agent or
+  model, keep the full trailer.
+
 - **Auto-approve now asks for consent** — launching with `--auto` (or its
   hidden aliases) no longer enables auto-approve silently: a confirm dialog
   warns that permission requests not explicitly denied will be approved

DIVERGENCES.md

@@ -98,6 +98,7 @@ from the squash message first, or use a plain merge.
 | `packages/tui/src/routes/session/index.tsx` | Flow transcript: the scrollbox opens with a home-like banner (`Logo` + `home_bottom` tips slot, `placement="start"`) as its first entry for root sessions (subagent sessions keep a plain 1-row pad), its `maxHeight` is clamped to the content height (a `transcriptHeight` signal read off the content's yoga node in the renderer root's `layout-changed` handler, which then re-runs `calculateLayout` so the clamp lands in the same frame — `scrollHeight` is a frame stale there, and painting with a stale clamp flickers during streaming) so the `Prompt` rides directly below the last message, and a trailing flexGrow spacer absorbs the leftover space until content fills the screen (then the prompt is effectively bottom-anchored and the banner scrolls away with history); the session `Prompt` gets home's `placeholder` pool when the session has no messages so the input shows an `Ask anything... "<suggestion>"` placeholder like home | Startup lands in an empty session instead of the home screen; the transcript flows top-down like terminal scrollback — logo top-left, input following the conversation down — instead of a bottom-anchored prompt with a void above it. | Keep our banner block inside the scrollbox, the `transcriptHeight` clamp + `layout-changed` listener, the trailing spacer, and the `placeholders` prop; take upstream's surrounding changes. |
 | `packages/tui/src/routes/session/index.tsx` | Sidebar visibility is session-local: removed upstream's persisted `kv.signal<"auto" \| "hide">("sidebar", "auto")` (and the `sidebar() === "auto" && wide()` branch of `sidebarVisible`); visibility is driven only by the non-persisted `sidebarOpen` signal, which the `session.sidebar.toggle` command flips (supersedes the earlier `"auto"` → `"hide"` default change) | The right sidebar starts hidden in every session regardless of terminal width or what the user did last session; `ctrl+b`/`<leader>b` only affects the current session. A stale `sidebar` key in existing kv.json files is simply never read. | Keep the kv signal removed and `sidebarVisible` reading only `parentID` + `sidebarOpen`; take upstream's surrounding changes. |
 | `packages/tui/src/routes/session/index.tsx` | Sidebar hint in the prompt footer: a `sidebarHint` memo (active-todo count from `sync.data.todo`, modified-file count from `sync.data.session_diff`, only when the sidebar is hidden and the session isn't a subagent; the label text comes from `sidebarHintLabel` in the fork-only `routes/session/sidebar-hint.ts`) plus a `sidebarShortcut` (`useCommandShortcut("session.sidebar.toggle")`), passed as the `Prompt`'s previously unused `hint` prop — e.g. `ctrl+b 3 todos · 5 files` | The sidebar starts hidden in this fork (see the row above), so users would otherwise never learn there are todos/modified files or how to reveal them. | Keep our `sidebarShortcut`/`sidebarHint` memos, the `sidebar-hint` import, and the `hint={…}` prop on `<Prompt>` (all additive); take upstream's surrounding changes. If upstream starts passing its own `hint` to this `<Prompt>`, merge the two under one `Show`. |
+| `packages/tui/src/routes/session/index.tsx` | Assistant-message trailer dedup: a `suppressed` memo in `AssistantMessage` hides the `▣ Agent · Model` prefix on the last message when it matches the currently selected agent (`local.agent.current()?.name === message.mode`) and model (`local.model.current()` vs the message's `providerID`/`modelID`), since the prompt footer right below already shows that selection; the duration still renders as `Baked for <duration>` (and `interrupted` keeps rendering on aborts), and the trailer box is skipped entirely when suppression leaves nothing to show | The last message's trailer and the prompt footer showed the same agent + model twice, one line apart. | Keep the `suppressed` memo and the `Show` gates around the trailer spans; take upstream's surrounding trailer changes (new suffixes should go inside the existing `<text>` with a `·` separator like `interrupted`). |
 | `packages/plugin/src/tui.ts` | `home_bottom` slot props widened from `{}` to `{ placement?: "center" \| "start" }` | The empty-session banner asks `home_bottom` contributors to left-align; optional prop keeps the home route and third-party plugins (no prop → centered) unchanged. | Keep our `placement` prop; take upstream's other slot-map changes. |
 | `packages/tui/src/feature-plugins/home/tips.tsx` | `home_bottom` slot fn reads the new `placement` prop; with `"start"` the tips box left-aligns (`flex-start`) and drops its `paddingTop` 3 | The top-left session banner needs the tip flush under the logo; the centered home route keeps upstream spacing. | Keep our `placement` threading + conditional alignItems/paddingTop; take upstream's surrounding changes. |
 | `packages/tui/src/feature-plugins/system/which-key.tsx` | `HomeHint` reads the new `placement` prop from the `home_bottom` slot; with `"start"` it left-aligns | Same top-left banner alignment as the tips row above. | Keep our `placement` threading + conditional alignItems; take upstream's surrounding changes. |

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

@@ -1549,6 +1549,18 @@ function AssistantMessage(props: { message: AssistantMessage; parts: Part[]; las
     return props.message.time.completed - user.time.created
   })
 
+  // the prompt footer already shows the current agent and model, so hide the
+  // trailer's copy on the last message when it would repeat that selection
+  const suppressed = createMemo(() => {
+    if (!props.last) return false
+    const currentModel = local.model.current()
+    return (
+      local.agent.current()?.name === props.message.mode &&
+      currentModel?.providerID === props.message.providerID &&
+      currentModel?.modelID === props.message.modelID
+    )
+  })
+
   const childShortcut = useCommandShortcut("session.child.first")
   const backgroundShortcut = useCommandShortcut("session.background")
 
@@ -1610,28 +1622,36 @@ function AssistantMessage(props: { message: AssistantMessage; parts: Part[]; las
       </Show>
       <Switch>
         <Match when={props.last || final() || props.message.error?.name === "MessageAbortedError"}>
-          <box ref={(el: BoxRenderable) => alwaysSeparate.add(el)} paddingLeft={3}>
-            <text marginTop={1}>
-              <span
-                style={{
-                  fg:
-                    props.message.error?.name === "MessageAbortedError"
-                      ? theme.textMuted
-                      : local.agent.color(props.message.agent),
-                }}
-              >
-                ▣{" "}
-              </span>{" "}
-              <span style={{ fg: theme.text }}>{Locale.titlecase(props.message.mode)}</span>
-              <span style={{ fg: theme.textMuted }}> · {model()}</span>
-              <Show when={duration()}>
-                <span style={{ fg: theme.textMuted }}> · {Locale.duration(duration())}</span>
-              </Show>
-              <Show when={props.message.error?.name === "MessageAbortedError"}>
-                <span style={{ fg: theme.textMuted }}> · interrupted</span>
-              </Show>
-            </text>
-          </box>
+          <Show when={!suppressed() || duration() || props.message.error?.name === "MessageAbortedError"}>
+            <box ref={(el: BoxRenderable) => alwaysSeparate.add(el)} paddingLeft={3}>
+              <text marginTop={1}>
+                <Show when={!suppressed()}>
+                  <span
+                    style={{
+                      fg:
+                        props.message.error?.name === "MessageAbortedError"
+                          ? theme.textMuted
+                          : local.agent.color(props.message.agent),
+                    }}
+                  >
+                    ▣{" "}
+                  </span>{" "}
+                  <span style={{ fg: theme.text }}>{Locale.titlecase(props.message.mode)}</span>
+                  <span style={{ fg: theme.textMuted }}> · {model()}</span>
+                </Show>
+                <Show when={duration()}>
+                  <span style={{ fg: theme.textMuted }}>
+                    {suppressed() ? `Baked for ${Locale.duration(duration())}` : ` · ${Locale.duration(duration())}`}
+                  </span>
+                </Show>
+                <Show when={props.message.error?.name === "MessageAbortedError"}>
+                  <span style={{ fg: theme.textMuted }}>
+                    {suppressed() && !duration() ? "interrupted" : " · interrupted"}
+                  </span>
+                </Show>
+              </text>
+            </box>
+          </Show>
         </Match>
       </Switch>
     </>