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/usage-chip.spec.ts

@@ -0,0 +1,94 @@
+// Token-usage chip (OPE-42): after a turn reports usage, a quiet meter+count chip appears
+// in the composer's bottom row; clicking it opens the per-model breakdown popover with the
+// context-window fill. The fake agent attaches fixed usage to every echo turn
+// (input 1k / output 200 / cache_read 8k / cache_write 800 — 10k per turn), and the
+// settings fixture maps the default model to a 200k context window.
+import { expect } from "@playwright/test";
+import { test } from "./fixtures";
+
+test("usage chip appears after a turn and opens the breakdown popover", async ({ page }) => {
+  await page.goto("/");
+  await page.getByText("Draft the launch note").first().click();
+
+  // Fresh session: no usage yet — the chip is hidden entirely.
+  await expect(page.getByTestId("usage-chip")).toHaveCount(0);
+
+  const box = page.getByPlaceholder(/Ask the coworker/);
+  await box.fill("hello");
+  await box.press("Enter");
+  await expect(page.getByText("Echo: hello", { exact: false }).first()).toBeVisible({
+    timeout: 10_000,
+  });
+
+  // Default: no bar — the chip states the in-context size (prompt side of the last
+  // turn: 1k + 8k + 800 = 9.8k). Session totals are on release hold (owner call
+  // 2026-08-24): context-window figures only, everywhere.
+  const chip = page.getByTestId("usage-chip");
+  await expect(chip).toContainText("9.8k");
+
+  // Popover: context fill only (9.8k prompt-side of 200k = 5%) — no totals breakdown.
+  await chip.click();
+  const pop = page.getByTestId("usage-popover");
+  await expect(pop).toBeVisible();
+  await expect(pop).toContainText("Context window");
+  await expect(pop).toContainText("9.8k of 200k · 5%");
+  await expect(pop).not.toContainText("Session totals");
+  await expect(pop).not.toContainText("Uncached input");
+  await expect(pop).not.toContainText("tokens");
+
+  // Context is a level, not a sum — a second identical turn leaves the chip unchanged.
+  // The scrim click closes the popover.
+  await page.mouse.click(10, 10);
+  await expect(pop).toHaveCount(0);
+  await box.fill("again");
+  await box.press("Enter");
+  await expect(page.getByText("Echo: again", { exact: false }).first()).toBeVisible({
+    timeout: 10_000,
+  });
+  await expect(chip).toContainText("9.8k");
+});
+
+test("usage resets on a new session", async ({ page }) => {
+  await page.goto("/");
+  await page.getByText("Draft the launch note").first().click();
+  const box = page.getByPlaceholder(/Ask the coworker/);
+  await box.fill("hello");
+  await box.press("Enter");
+  await expect(page.getByTestId("usage-chip")).toBeVisible({ timeout: 10_000 });
+
+  // "＋ New session" wipes the transcript — and the usage accumulation with it.
+  await page.getByRole("button", { name: /New session/ }).first().click();
+  await expect(page.getByTestId("usage-chip")).toHaveCount(0);
+});
+
+test("Settings toggle turns the context bar on; default is the in-context number", async ({ page }) => {
+  await page.goto("/");
+  await page.getByText("Draft the launch note").first().click();
+  const box = page.getByPlaceholder(/Ask the coworker/);
+  await box.fill("hello");
+  await box.press("Enter");
+  const chip = page.getByTestId("usage-chip");
+  await expect(chip).toContainText("9.8k", { timeout: 10_000 }); // default: in-context size, no bar
+
+  // Turn the bar ON in Settings -> General.
+  await page.getByTestId("account-row").click();
+  await page.getByRole("button", { name: "Settings", exact: true }).click();
+  await expect(page.getByTestId("context-bar-toggle")).not.toBeChecked();
+  const [req] = await Promise.all([
+    page.waitForRequest(
+      (r) => r.url().endsWith("/v1/settings/context-bar") && r.method() === "POST",
+    ),
+    page.getByTestId("context-bar-toggle").check(),
+  ]);
+  expect(req.postDataJSON()).toEqual({ context_bar: true });
+
+  // Reload so the app re-reads settings: the chip is now the fill bar, not a number.
+  await page.goto("/");
+  await page.getByText("Draft the launch note").first().click();
+  await page.getByPlaceholder(/Ask the coworker/).fill("hello");
+  await page.getByPlaceholder(/Ask the coworker/).press("Enter");
+  const bar = page.getByTestId("usage-chip");
+  await expect(bar).toBeVisible({ timeout: 10_000 });
+  await expect(bar).not.toContainText("9.8k");
+  await expect(bar).toHaveAttribute("title", /Context window 5% full/);
+});