fix(web): 宽屏下侧栏贴边而内容固定居中，中间空出一大块

问题：侧栏贴左边，内容区却用 mx-auto max-w-6xl 居中，窗口一宽就出现
"侧栏到内容之间一大片空白、内容右侧又一大片空白"的割裂感。2K 屏上尤其明显。

做法（用户给的两个方向里选"侧栏贴边 + 内容自适应"）：

- AppShell 内容区去掉居中与固定宽度，改为随窗口铺开，断点加宽内边距
  （lg 32 / xl 48 / 2xl 64），侧栏在 xl 从 240 加宽到 264
- 宽了之后不能只是把元素拉长，所以同步改成"用宽度"而不是"被拉长"：
  - 任务行：md 以上标题左、状态/优先级/截止/标签右对齐成一行，窄屏仍折两行
  - 知识、工单列表：md 两列 / 2xl 三列，卡片不再横跨整屏
  - 看板本来就是四等分列，自适应后自然铺满
- PageHeader 的描述文字限 max-w-3xl，宽屏下不出现过长的行宽

e2e/shots.mjs 支持 VIEWPORT=2560x1400 SUFFIX=-wide 覆盖视口，用来核对宽屏。
三个 e2e 复跑全绿；tsc 0 错，构建 242.02 kB / gzip 76.78 kB。

web/e2e/shots.mjs

@@ -46,10 +46,14 @@ await call(`/workspaces/${wsId}/knowledge`, { title: "报销单必须贴发票
 
 const me = await call("/workspaces/" + wsId + "/members", null, token, "GET").catch(() => null);
 
+// 视口可覆盖，用来核对宽屏布局：VIEWPORT=2560x1400 SUFFIX=-wide node e2e/shots.mjs
+const [VW, VH] = (process.env.VIEWPORT ?? "1440x960").split("x").map(Number);
+const SUFFIX = process.env.SUFFIX ?? "";
+
 const browser = await chromium.launch({
   executablePath: "C:\\Users\\Steven\\AppData\\Local\\ms-playwright\\chromium-1223\\chrome-win64\\chrome.exe",
 });
-const page = await browser.newPage({ viewport: { width: 1440, height: 960 }, deviceScaleFactor: 1 });
+const page = await browser.newPage({ viewport: { width: VW, height: VH }, deviceScaleFactor: 1 });
 await page.goto(WEB + "/login");
 await page.evaluate(([t, r]) => {
   localStorage.setItem("dadao.access", t);
@@ -61,13 +65,17 @@ async function shot(url, name, prep) {
   await page.goto(WEB + url, { waitUntil: "networkidle" });
   if (prep) await prep();
   await page.waitForTimeout(600);
-  const file = `e2e/artifacts/ui-${name}.png`;
+  const file = `e2e/artifacts/ui-${name}${SUFFIX}.png`;
   await page.screenshot({ path: file, fullPage: false });
   shots.push(file);
 }
 
 await shot("/", "home");
 await shot(`/w/${wsId}`, "tasks");
+await shot(`/w/${wsId}`, "tasks-all", async () => {
+  await page.getByRole("button", { name: "全部", exact: true }).click();
+  await page.waitForTimeout(500);
+});
 await shot(`/w/${wsId}/board`, "board");
 await shot(`/w/${wsId}/tickets`, "tickets");
 await shot(`/w/${wsId}/knowledge`, "knowledge");

web/src/components/AppShell.tsx

@@ -105,7 +105,7 @@ export function AppShell({
   return (
     <div className="flex min-h-full flex-col bg-paper-100 lg:flex-row">
       {/* —— 侧栏（桌面）—— */}
-      <aside className="sticky top-0 z-20 hidden h-screen w-60 shrink-0 flex-col border-r border-line-200 bg-paper-50 lg:flex">
+      <aside className="sticky top-0 z-20 hidden h-screen w-60 shrink-0 flex-col border-r border-line-200 bg-paper-50 lg:flex xl:w-[264px]">
         <div className="px-5 pb-4 pt-5">
           <Link to="/" className="flex items-center gap-2.5">
             <Logo size={30} />
@@ -246,7 +246,12 @@ export function AppShell({
       </header>
 
       <main className="min-w-0 flex-1">
-        <div className="mx-auto w-full max-w-6xl px-5 py-6 lg:px-9 lg:py-8">{children}</div>
+        {/*
+          内容区随窗口变宽（不再固定 max-w-6xl 居中）：
+          侧栏贴左，内容从侧栏右侧一直铺到右边距，宽屏下不留"两边各一大块空白"。
+          文字类的阅读宽度靠各自的 max-w-3xl 约束，列表/看板这类适合铺开的结构则吃满。
+        */}
+        <div className="w-full px-5 py-6 lg:px-8 lg:py-8 xl:px-12 2xl:px-16">{children}</div>
       </main>
     </div>
   );

web/src/components/ui.tsx

@@ -173,12 +173,13 @@ export function PageHeader({
 }) {
   return (
     <header className="mb-6 flex flex-wrap items-end justify-between gap-3">
-      <div>
+      <div className="min-w-0">
         {eyebrow ? <div className="mb-1 text-2xs font-medium text-ink-400">{eyebrow}</div> : null}
         <h1 className="text-2xl font-semibold">{title}</h1>
-        {desc ? <p className="mt-1 text-sm text-ink-500">{desc}</p> : null}
+        {/* 宽屏下正文行宽不跟着拉长，40~60 字一行最易读 */}
+        {desc ? <p className="mt-1 max-w-3xl text-sm text-ink-500">{desc}</p> : null}
       </div>
-      {actions ? <div className="flex items-center gap-2">{actions}</div> : null}
+      {actions ? <div className="flex shrink-0 items-center gap-2">{actions}</div> : null}
     </header>
   );
 }

web/src/pages/Knowledge.tsx

@@ -221,7 +221,7 @@ export function KnowledgePage() {
           />
         </div>
       ) : (
-        <ul className="space-y-2">
+        <ul className="grid gap-2 md:grid-cols-2 2xl:grid-cols-3">
           {docs.map((d) => (
             <li
               key={d.id}

web/src/pages/Tasks.tsx

@@ -256,16 +256,17 @@ export function TasksPage() {
                   />
                 )}
 
-                <div className="min-w-0 flex-1">
+                {/* 宽屏把元信息推到右侧，一行读完；窄屏仍折到标题下面 */}
+                <div className="min-w-0 flex-1 md:flex md:items-center md:gap-3">
                   <button
-                    className={`block w-full truncate text-left text-sm transition-colors ${
+                    className={`block w-full truncate text-left text-sm transition-colors md:flex-1 ${
                       done ? "text-ink-400 line-through" : "text-ink-900 hover:text-primary-700"
                     }`}
                     onClick={() => setOpenId(item.id)}
                   >
                     {item.title}
                   </button>
-                  <div className="mt-1.5 flex flex-wrap items-center gap-1.5 text-2xs">
+                  <div className="mt-1.5 flex flex-wrap items-center gap-1.5 text-2xs md:mt-0 md:shrink-0 md:justify-end">
                     <StatusPill status={item.status} label={STATUS_LABEL[item.status]} />
                     {item.priority > 0 && (
                       <span className="chip">

web/src/pages/Tickets.tsx

@@ -149,7 +149,7 @@ export function TicketsPage() {
           />
         </div>
       ) : (
-        <ul className="space-y-2">
+        <ul className="grid gap-2 md:grid-cols-2 2xl:grid-cols-3">
           {tickets.map((t) => (
             <li
               key={t.id}