feat: OpenMesh 基础平台与 MD/PDF 转换技能

- 后端: coworker 智能体框架, WS API, 文件上传, 附件处理
- 前端: Open WebUI, 文件全量走 upload API (含 MD/TXT/JSON 等文本类)
- 技能: md-to-office (pandoc + wkhtmltopdf)
- 修复: 上传文件路径丢失, Agent 搜索浪费, 输出文件跑到 uploads/
- 打包: PyInstaller one-dir, 预打包 pandoc/wkhtmltopdf/chromium

surfaces/gui/e2e/session-shell.spec.ts

@@ -0,0 +1,77 @@
+// Session-screen cleanup (§22): the contextual top-left cluster ([sidebar][+][search], rendered
+// ONLY while the sidebar is collapsed), the centered facts subtitle (persona · model — fixed
+// facts replacing the locked-model pill and the topbar About-persona button), and the model
+// picker's fresh-session-only placement.
+import { expect } from "@playwright/test";
+import { test } from "./fixtures";
+
+test("top-left cluster renders only while the sidebar is collapsed", async ({ page }) => {
+  await page.goto("/");
+
+  // Expanded sidebar owns those actions — no duplicate cluster.
+  await expect(page.locator(".sidebar")).toBeVisible();
+  await expect(page.getByTestId("topbar-cluster")).toHaveCount(0);
+
+  // Collapse → the cluster appears with all three actions; the floating reveal button does NOT
+  // double up on the session surface (the cluster's sidebar button replaces it).
+  await page.keyboard.press("Meta+b");
+  const cluster = page.getByTestId("topbar-cluster");
+  await expect(cluster).toBeVisible();
+  await expect(cluster.getByRole("button", { name: "Show sidebar" })).toBeVisible();
+  await expect(cluster.getByRole("button", { name: "New session" })).toBeVisible();
+  await expect(cluster.getByRole("button", { name: "Search" })).toBeVisible();
+  await expect(page.locator(".nav-reveal-btn")).toHaveCount(0);
+
+  // The cluster's search opens the command-palette overlay.
+  await cluster.getByRole("button", { name: "Search" }).click();
+  await expect(page.getByPlaceholder("Search chats")).toBeVisible();
+  await page.keyboard.press("Escape");
+
+  // The cluster's sidebar button docks the nav back — and the cluster leaves with it.
+  await cluster.getByRole("button", { name: "Show sidebar" }).click();
+  await expect(page.locator(".app")).not.toHaveClass(/nav-collapsed/);
+  await expect(page.getByTestId("topbar-cluster")).toHaveCount(0);
+});
+
+test("facts subtitle: absent on a fresh session, coworker + model after the first turn, inert", async ({
+  page,
+}) => {
+  await page.goto("/");
+
+  // Fresh-ish (boot-resumed, no rendered history): no subtitle, no old About-persona button —
+  // and the model is a live PICKER in the composer (fresh sessions choose; nothing is locked yet).
+  await expect(page.getByTestId("session-subtitle")).toHaveCount(0);
+  await expect(page.getByRole("button", { name: "About this persona" })).toHaveCount(0);
+  await expect(page.locator(".dd").filter({ hasText: "Claude Opus 4.8" })).toBeVisible();
+
+  // First turn → the facts move up to the subtitle; the picker STAYS in the composer
+  // (§17 rev 2026-07-22: mid-session model switching shipped, so it remains actionable).
+  const box = page.getByPlaceholder(/Ask the coworker/);
+  await box.fill("hello");
+  await page.getByRole("button", { name: "Send" }).click();
+  await expect(page.getByText(/Echo: hello/)).toBeVisible();
+
+  // Coworker + model (UX-029 restored the coworker name — the picker shipped), and the
+  // subtitle is a plain fact line, not a button to the persona page.
+  const sub = page.getByTestId("session-subtitle");
+  await expect(sub).toHaveText("Coworker · Claude Opus 4.8");
+  await expect(page.locator(".dd").filter({ hasText: "Claude Opus 4.8" })).toBeVisible();
+  await sub.click();
+  await expect(page.getByRole("button", { name: "Back", exact: true })).toHaveCount(0);
+});
+
+test("composer is three controls (+ attach · Mode · send); folder and branch chips are gone", async ({
+  page,
+}) => {
+  await page.goto("/");
+  await page.getByText("Draft the launch note").first().click();
+
+  await expect(page.getByRole("button", { name: "Attach" })).toBeVisible();
+  await expect(page.getByRole("button", { name: "Mode", exact: true })).toBeVisible();
+  await expect(page.getByRole("button", { name: "Send" })).toBeVisible();
+  // The folder/roots popover trigger and the standalone Inbox control left the composer (§22).
+  await expect(page.getByTitle(/director(y|ies) the agent can use/)).toHaveCount(0);
+  await expect(page.getByTitle("Inbox routing")).toHaveCount(0);
+  await expect(page.locator(".wschip")).toHaveCount(0);
+  await expect(page.locator(".wsbranch")).toHaveCount(0);
+});