fix: logo 右半部分从 CODING 改为 CODE

去掉难以正确渲染的 N 和 G 字母，右半部分简化为 CODE（4 字母），
与左半部分 AIR 组合为 AIR CODE。

packages/app/src/components/prompt-input/editor-dom.test.ts

@@ -0,0 +1,99 @@
+import { describe, expect, test } from "bun:test"
+import { createTextFragment, getCursorPosition, getNodeLength, getTextLength, setCursorPosition } from "./editor-dom"
+
+describe("prompt-input editor dom", () => {
+  test("createTextFragment preserves newlines with consecutive br nodes", () => {
+    const fragment = createTextFragment("foo\n\nbar")
+    const container = document.createElement("div")
+    container.appendChild(fragment)
+
+    expect(container.childNodes.length).toBe(4)
+    expect(container.childNodes[0]?.textContent).toBe("foo")
+    expect((container.childNodes[1] as HTMLElement).tagName).toBe("BR")
+    expect((container.childNodes[2] as HTMLElement).tagName).toBe("BR")
+    expect(container.childNodes[3]?.textContent).toBe("bar")
+  })
+
+  test("createTextFragment keeps trailing newline as terminal break", () => {
+    const fragment = createTextFragment("foo\n")
+    const container = document.createElement("div")
+    container.appendChild(fragment)
+
+    expect(container.childNodes.length).toBe(2)
+    expect(container.childNodes[0]?.textContent).toBe("foo")
+    expect((container.childNodes[1] as HTMLElement).tagName).toBe("BR")
+  })
+
+  test("createTextFragment avoids break-node explosion for large multiline content", () => {
+    const content = Array.from({ length: 220 }, () => "line").join("\n")
+    const fragment = createTextFragment(content)
+    const container = document.createElement("div")
+    container.appendChild(fragment)
+
+    expect(container.childNodes.length).toBe(1)
+    expect(container.childNodes[0]?.nodeType).toBe(Node.TEXT_NODE)
+    expect(container.textContent).toBe(content)
+  })
+
+  test("createTextFragment keeps terminal break in large multiline fallback", () => {
+    const content = `${Array.from({ length: 220 }, () => "line").join("\n")}\n`
+    const fragment = createTextFragment(content)
+    const container = document.createElement("div")
+    container.appendChild(fragment)
+
+    expect(container.childNodes.length).toBe(2)
+    expect(container.childNodes[0]?.textContent).toBe(content.slice(0, -1))
+    expect((container.childNodes[1] as HTMLElement).tagName).toBe("BR")
+  })
+
+  test("length helpers treat breaks as one char and ignore zero-width chars", () => {
+    const container = document.createElement("div")
+    container.appendChild(document.createTextNode("ab\u200B"))
+    container.appendChild(document.createElement("br"))
+    container.appendChild(document.createTextNode("cd"))
+
+    expect(getNodeLength(container.childNodes[0]!)).toBe(2)
+    expect(getNodeLength(container.childNodes[1]!)).toBe(1)
+    expect(getTextLength(container)).toBe(5)
+  })
+
+  test("setCursorPosition and getCursorPosition round-trip with pills and breaks", () => {
+    const container = document.createElement("div")
+    const pill = document.createElement("span")
+    pill.dataset.type = "file"
+    pill.textContent = "@file"
+    container.appendChild(document.createTextNode("ab"))
+    container.appendChild(pill)
+    container.appendChild(document.createElement("br"))
+    container.appendChild(document.createTextNode("cd"))
+    document.body.appendChild(container)
+
+    setCursorPosition(container, 2)
+    expect(getCursorPosition(container)).toBe(2)
+
+    setCursorPosition(container, 7)
+    expect(getCursorPosition(container)).toBe(7)
+
+    setCursorPosition(container, 8)
+    expect(getCursorPosition(container)).toBe(8)
+
+    container.remove()
+  })
+
+  test("setCursorPosition and getCursorPosition round-trip across blank lines", () => {
+    const container = document.createElement("div")
+    container.appendChild(document.createTextNode("a"))
+    container.appendChild(document.createElement("br"))
+    container.appendChild(document.createElement("br"))
+    container.appendChild(document.createTextNode("b"))
+    document.body.appendChild(container)
+
+    setCursorPosition(container, 2)
+    expect(getCursorPosition(container)).toBe(2)
+
+    setCursorPosition(container, 3)
+    expect(getCursorPosition(container)).toBe(3)
+
+    container.remove()
+  })
+})