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/nav-collapse.spec.ts

@@ -0,0 +1,51 @@
+// Left-nav polish (§20): collapse (⌘B / brand button → reveal button docks it back) and the
+// RECENT-header group/filter popover (Group by Persona↔Chronological, Filter by coworker).
+import { expect } from "@playwright/test";
+import { test } from "./fixtures";
+
+test("collapse hides the sidebar and reclaims the width; reveal button docks it back", async ({
+  page,
+}) => {
+  await page.goto("/");
+  const app = page.locator(".app");
+  await expect(page.locator(".sidebar")).toBeVisible();
+
+  // Collapse via the brand button.
+  await page.getByRole("button", { name: "Collapse sidebar" }).click();
+  await expect(app).toHaveClass(/nav-collapsed/);
+  // The floating reveal affordance appears; clicking it docks the nav back.
+  const reveal = page.getByRole("button", { name: "Show sidebar" });
+  await expect(reveal).toBeVisible();
+  await reveal.click();
+  await expect(app).not.toHaveClass(/nav-collapsed/);
+});
+
+test("⌘B toggles the sidebar collapse", async ({ page }) => {
+  await page.goto("/");
+  const app = page.locator(".app");
+  await page.keyboard.press("Meta+b");
+  await expect(app).toHaveClass(/nav-collapsed/);
+  await page.keyboard.press("Meta+b");
+  await expect(app).not.toHaveClass(/nav-collapsed/);
+});
+
+test("RECENT header group/filter popover: switch grouping + see coworker filters", async ({
+  page,
+}) => {
+  await page.goto("/");
+  const header = page.getByTestId("recent-header");
+  await expect(header).toContainText("Recent");
+
+  await header.getByRole("button", { name: "Group and filter conversations" }).click();
+  const menu = page.getByTestId("group-filter-menu");
+  await expect(menu).toContainText("Group by");
+  await expect(menu).toContainText("Filter by coworker");
+
+  // Switch to Chronological → the persona accordion collapses into a flat list (the "OpenWorker"
+  // persona group header is no longer a row; sessions list directly).
+  await menu.getByText("Chronological").click();
+  await expect(menu.getByText("Chronological").locator("xpath=..")).toContainText("✓");
+
+  // Filter-by-coworker checkboxes are present (none checked by default → all shown).
+  await expect(menu).toContainText("None checked shows all.");
+});