style(tui): simplify runtime header controls

tui/src/app.test.ts

@@ -205,7 +205,7 @@ describe("NanobotTui layout", () => {
       expect(occurrences(frame, "Ask nanobot anything")).toBe(1)
       expect(occurrences(frame, "Ready")).toBe(0)
       expect(occurrences(frame, "Getting ready…")).toBe(1)
-      expect(occurrences(frame, "nanobot     test/model")).toBe(1)
+      expect(occurrences(frame, "default ▾")).toBe(1)
     }
 
     app.accept({ event: "attached", chat_id: "chat" })
@@ -985,7 +985,6 @@ describe("NanobotTui layout", () => {
     const ui = app as unknown as {
       composer: TextareaRenderable
       sessionMenu: { visible: boolean }
-      titleText: { plainText: string }
       runtimeControls: { modelText: { plainText: string } }
     }
 
@@ -999,8 +998,7 @@ describe("NanobotTui layout", () => {
       ui.composer.submit()
       await waitUntil(() => attached.length === 1)
       expect(attached).toEqual(["other"])
-      expect(ui.titleText.plainText).toContain("Release checklist")
-      expect(ui.runtimeControls.modelText.plainText).toContain("Deep Research")
+      expect(ui.runtimeControls.modelText.plainText).toBe("Deep Research ▾")
       expect(ui.runtimeControls.modelText.plainText).not.toContain("test/model")
 
       app.accept({ event: "attached", chat_id: "other" })
@@ -1009,8 +1007,7 @@ describe("NanobotTui layout", () => {
       ui.composer.submit()
       await waitUntil(() => newChats.length === 1)
       expect(newChats).toEqual(["new"])
-      expect(ui.titleText.plainText).toContain("New chat")
-      expect(ui.runtimeControls.modelText.plainText).toContain("test/model")
+      expect(ui.runtimeControls.modelText.plainText).toBe("default ▾")
     } finally {
       globalThis.fetch = original
     }
@@ -1182,7 +1179,8 @@ describe("NanobotTui layout", () => {
       model_preset: "Codex",
     })
     await setup.flush()
-    expect(ui.runtimeControls.modelText.plainText).toContain("Codex     openai/gpt-5.6")
+    expect(ui.runtimeControls.modelText.plainText).toBe("Codex ▾")
+    expect(ui.runtimeControls.modelText.plainText).not.toContain("openai/gpt-5.6")
 
     app.accept({
       event: "runtime_model_updated",
@@ -1190,7 +1188,7 @@ describe("NanobotTui layout", () => {
       model_preset: "DeepSeek",
     })
     await setup.flush()
-    expect(ui.runtimeControls.modelText.plainText).toContain("Codex     openai/gpt-5.6")
+    expect(ui.runtimeControls.modelText.plainText).toBe("Codex ▾")
     expect(ui.runtimeControls.modelText.plainText).not.toContain("DeepSeek")
   })
 
@@ -1212,8 +1210,8 @@ describe("NanobotTui layout", () => {
     })
     await setup.flush()
 
-    expect(ui.runtimeControls.modelText.plainText).toContain("deepseek/deepseek-chat")
-    expect(ui.runtimeControls.modelText.plainText).not.toContain("Codex")
+    expect(ui.runtimeControls.modelText.plainText).toBe("default ▾")
+    expect(ui.runtimeControls.modelText.plainText).not.toContain("deepseek/deepseek-chat")
   })
 
   test("refreshes the canonical preset after the model command completes", async () => {
@@ -1309,7 +1307,6 @@ describe("NanobotTui layout", () => {
         menuRoot: { getChildren(): unknown[] }
       }
       composer: TextareaRenderable
-      titleText: TextRenderable
       status: TextRenderable
       meta: TextRenderable
     }
@@ -1324,7 +1321,6 @@ describe("NanobotTui layout", () => {
       expect(ui.runtimeControls.modelText.selectable).toBe(false)
       expect(ui.runtimeControls.accessText.selectable).toBe(false)
       expect(ui.runtimeControls.contextText.selectable).toBe(false)
-      expect(ui.titleText.selectable).toBe(false)
       expect(ui.status.selectable).toBe(false)
       expect(ui.meta.selectable).toBe(false)
       app.accept({ event: "goal_status", chat_id: "chat", status: "running" })
@@ -1394,7 +1390,7 @@ describe("NanobotTui layout", () => {
     }
   })
 
-  test("opens and switches sessions from the clickable title", async () => {
+  test("switches sessions only through the sessions command", async () => {
     const original = globalThis.fetch
     globalThis.fetch = ((input: string | URL | Request) => {
       const url = String(input)
@@ -1420,14 +1416,18 @@ describe("NanobotTui layout", () => {
     const ui = app as unknown as {
       composer: TextareaRenderable
       sessionMenu: { visible: boolean; root: { getChildren(): unknown[] } }
-      titleText: TextRenderable
-      status: TextRenderable
+      title: { getChildren(): unknown[] }
     }
 
     try {
       await waitUntil(() => (app as unknown as { ready: boolean }).ready)
       await setup.renderOnce()
-      await setup.mockMouse.click(ui.titleText.x + 2, ui.titleText.y)
+      const titleItems = ui.title.getChildren() as TextRenderable[]
+      expect(titleItems.some((item) => item.id === "nanobot-tui-title-text")).toBe(false)
+      expect(ui.sessionMenu.visible).toBe(false)
+
+      ui.composer.setText("/sessions")
+      ui.composer.submit()
       await waitUntil(() => ui.sessionMenu.visible)
       await setup.flush()
       expect(ui.composer.placeholder).toBe("Search sessions")
@@ -1441,15 +1441,6 @@ describe("NanobotTui layout", () => {
       expect(attached).toEqual(["other"])
       expect(ui.sessionMenu.visible).toBe(false)
       expect(ui.composer.focused).toBe(true)
-      expect(ui.titleText.plainText).toContain("Release checklist")
-
-      app.accept({ event: "attached", chat_id: "other" })
-      await setup.mockMouse.click(ui.titleText.x + 2, ui.titleText.y)
-      await waitUntil(() => ui.sessionMenu.visible)
-      ui.composer.blur()
-      await setup.mockMouse.click(ui.status.x, ui.status.y)
-      expect(ui.sessionMenu.visible).toBe(false)
-      expect(ui.composer.focused).toBe(true)
     } finally {
       globalThis.fetch = original
     }
@@ -1715,7 +1706,7 @@ describe("NanobotTui layout", () => {
       await setup.flush()
       const frame = setup.captureCharFrame()
       expect(frame).toContain("Release checklist")
-      expect(occurrences(frame, "Current chat")).toBe(1)
+      expect(occurrences(frame, "Current chat")).toBe(0)
     } finally {
       globalThis.fetch = original
     }
@@ -1959,7 +1950,7 @@ describe("NanobotTui layout", () => {
       } else if (width >= 28 && height >= 9) {
         expect(occurrences(frame, "Enter now · Tab next")).toBe(1)
       }
-      expect(occurrences(frame, "nanobot     test/model")).toBe(height >= 14 ? 1 : 0)
+      expect(occurrences(frame, "default ▾")).toBe(height >= 14 ? 1 : 0)
     }
   })
 
@@ -3122,7 +3113,7 @@ describe("NanobotTui with a Herdr pane title reporter", () => {
     await setup.flush()
     const activeFrame = setup.captureCharFrame()
     expect(activeFrame).toContain(">_  nanobot")
-    expect(activeFrame).toContain("test/model")
+    expect(activeFrame).toContain("default ▾")
     expect(occurrences(activeFrame, "› Ship the Herdr integration")).toBe(1)
     expect(occurrences(activeFrame, "app.ts")).toBe(1)
     expect(ui.composer.placeholder).toBe("Enter send now · Tab send next")

tui/src/app.ts

@@ -442,7 +442,6 @@ export class NanobotTui {
   private readonly client: ChatClient
   private readonly shell: BoxRenderable
   private readonly title: BoxRenderable
-  private readonly titleText: TextRenderable
   private readonly composerFrame: BoxRenderable
   private readonly composer: TextareaRenderable
   private composerSyntax: SyntaxStyle
@@ -649,28 +648,6 @@ export class NanobotTui {
       alignItems: "center",
       backgroundColor: RGBA.defaultBackground(),
     })
-    this.titleText = new TextRenderable(renderer, {
-      id: "nanobot-tui-title-text",
-      content: "nanobot",
-      height: 1,
-      flexShrink: 0,
-      truncate: true,
-      fg: this.palette.muted,
-      selectable: false,
-      onMouseOver: () => { this.titleText.fg = this.palette.accent },
-      onMouseOut: () => this.renderTitleColor(),
-      onMouseDown: (event) => {
-        if (event.button !== 0) return
-        event.preventDefault()
-        event.stopPropagation()
-        this.renderer.clearSelection()
-        if (this.sessionLoading || this.sessionMenu.visible) {
-          this.closeSessions()
-          return
-        }
-        void this.openSessions()
-      },
-    })
     this.runtimeControls = new RuntimeControls(
       renderer,
       runtimeControlsTheme(this.palette),
@@ -703,7 +680,6 @@ export class NanobotTui {
         },
       },
     )
-    this.title.add(this.titleText)
     this.title.add(this.runtimeControls.modelText)
     this.title.add(this.runtimeControls.accessText)
     this.title.add(this.runtimeControls.contextText)
@@ -1877,7 +1853,6 @@ export class NanobotTui {
     this.composer.syntaxStyle = this.composerSyntax
     this.syncComposerImageHighlights(this.composer.plainText)
     void this.renderer.idle().catch(() => {}).finally(() => previousComposerSyntax.destroy())
-    this.renderTitleColor()
     this.status.fg = this.palette.muted
     this.meta.fg = this.palette.faint
     this.updateMeta()
@@ -1957,9 +1932,6 @@ export class NanobotTui {
   }
 
   private updateTitle(): void {
-    const identity = this.sessionTitle.trim() || "nanobot"
-    this.titleText.maxWidth = Math.max(8, Math.floor(this.renderer.width * 0.38))
-    this.titleText.content = identity
     const context = this.contextTokens === null
       ? ""
       : `     ~${formatTokenCount(this.contextTokens)}${this.contextWindowTokens
@@ -1969,12 +1941,6 @@ export class NanobotTui {
     this.runtimeControls.updateContext(context)
   }
 
-  private renderTitleColor(): void {
-    this.titleText.fg = this.sessionLoading || this.sessionMenu.visible
-      ? this.palette.accent
-      : this.palette.muted
-  }
-
   private resizeComposer(): void {
     const verticalPadding = this.renderer.height >= 12 ? 1 : 0
     const maxContentHeight = Math.max(1, Math.min(12, Math.floor(this.renderer.height / 3)))
@@ -2385,7 +2351,6 @@ export class NanobotTui {
     this.contextPanel.hide()
     this.clearComposer()
     this.sessionLoading = true
-    this.renderTitleColor()
     const loadId = ++this.sessionLoadId
     this.status.content = "Loading sessions…"
     try {
@@ -2412,7 +2377,6 @@ export class NanobotTui {
         this.defaultModelPreset,
       )
       this.startSessionRefresh()
-      this.renderTitleColor()
       this.sessionMenu.update(this.composer.plainText, limit)
       this.syncComposerPlaceholder()
       this.updateMeta()
@@ -2420,7 +2384,6 @@ export class NanobotTui {
     } catch (error) {
       if (loadId !== this.sessionLoadId) return
       this.sessionLoading = false
-      this.renderTitleColor()
       this.status.content = error instanceof Error ? error.message : String(error)
     }
   }
@@ -2579,7 +2542,6 @@ export class NanobotTui {
     this.sessionLoadId += 1
     this.sessionLoading = false
     this.hideSessionMenu()
-    this.renderTitleColor()
     this.clearComposer()
     this.syncComposerPlaceholder()
     this.composer.focus()

tui/src/runtime-controls.ts

@@ -309,10 +309,7 @@ export class RuntimeControls {
   }
 
   private render(): void {
-    const runtime = this.modelPreset !== "default"
-      ? [this.modelPreset, this.model].filter(Boolean).join("     ")
-      : this.model
-    this.modelText.content = `     ${runtime} ▾`
+    this.modelText.content = `${this.modelPreset} ▾`
     const access = this.scope.access_mode === "full" ? "full access" : "workspace access"
     this.accessText.content = `     ${access} ▾`
     this.renderColors()