fix(web): clamp preset card descriptions instead of sizing the roster

A preset publishes its own description, of any length, and `.cards` sizes
rows with `grid-auto-rows: 1fr` — which makes every implicit row the same
height, not just the row holding the tall card. One long description
therefore set the height of the whole roster.

The description now clamps to four lines and offers the rest through the
shared Tooltip, attached only while the element actually overflows. Card
height stays derived: with the description bounded, `grid-auto-rows: 1fr`
already equalizes, and a card carrying the broken-preset reason or a
revealed path still sizes itself.

Tooltip gains an optional `maxWidth`; its default half-viewport cap
renders a description wider than the settings dialog it belongs to.

The failed-shape-check badge reads "Failed to load" rather than "Broken":
discovery reports a composition that is missing, unreadable, or malformed,
which overstates as damage.

Fixes #2238

apps/web/tests/agent-preset-authoring.e2e.ts

@@ -196,18 +196,18 @@ describe('web e2e: agent-preset authoring is a host-side copy', () => {
     const dialog = settingsDialog()
     await dialog.getByRole('button', { name: '通用设置' }).click()
     await dialog.getByRole('button', { name: 'Agent 预设' }).click()
-    await dialog.getByText('已损坏').first().waitFor({ timeout: 10_000 })
+    await dialog.getByText('加载失败').first().waitFor({ timeout: 10_000 })
 
     const snapshot = withPresetRoot(
       await captureStableAria(page, '[role="dialog"]', scaffold.workspaceCwd))
     await compareOrRefreshGolden(DAMAGED_EXPECTED, snapshot, MODE)
     // Both damage shapes surface as marked, unselectable, uncopyable cards
     // that still carry their metadata and the discovery-reported reason.
-    expect(snapshot).toContain('已损坏: broken-yaml')
-    expect(snapshot).toContain('已损坏: 幽灵预设')
+    expect(snapshot).toContain('加载失败: broken-yaml')
+    expect(snapshot).toContain('加载失败: 幽灵预设')
     expect(snapshot).toContain('not valid YAML')
     expect(snapshot).toContain('agent.cordis.yml is missing')
-    expect(await dialog.getByRole('button', { name: '已损坏: broken-yaml' }).isDisabled()).toBe(true)
+    expect(await dialog.getByRole('button', { name: '加载失败: broken-yaml' }).isDisabled()).toBe(true)
     expect(await dialog.getByRole('button', { name: '复制: 幽灵预设' }).isDisabled()).toBe(true)
     // A broken card offers no "set default" affordance at all — the aria name
     // IS the broken marking, so the picking name must not exist.

apps/web/tests/snapshots/agent-preset-authoring/damaged.expected.md

@@ -61,8 +61,8 @@
   - heading "自定义" [level=3]
   - list:
     - listitem:
-      - 'button "已损坏: broken-yaml" [disabled]':
-        - text: broken-yaml 已损坏 自定义 暂无描述。
+      - 'button "加载失败: broken-yaml" [disabled]':
+        - text: broken-yaml 加载失败 自定义 暂无描述。
         - alert: "the composition is not valid YAML: unexpected end of the stream within a flow collection (3:1)"
         - code: broken-yaml
       - 'button "查看路径: broken-yaml"':
@@ -70,13 +70,13 @@
         - text: 查看路径
       - 'button "复制: broken-yaml" [disabled]':
         - img
-        - text: 预设已损坏，无法复制
+        - text: 预设加载失败，不能复制
       - 'button "删除: broken-yaml"':
         - img
         - text: 删除
     - listitem:
-      - 'button "已损坏: 幽灵预设" [disabled]':
-        - text: 幽灵预设 已损坏 自定义 composition 已被手动删除。
+      - 'button "加载失败: 幽灵预设" [disabled]':
+        - text: 幽灵预设 加载失败 自定义 composition 已被手动删除。
         - alert: the composition file agent.cordis.yml is missing — the directory still occupies the id; delete it or restore the file
         - code: ghost
       - 'button "查看路径: 幽灵预设"':
@@ -84,7 +84,7 @@
         - text: 查看路径
       - 'button "复制: 幽灵预设" [disabled]':
         - img
-        - text: 预设已损坏，无法复制
+        - text: 预设加载失败，不能复制
       - 'button "删除: 幽灵预设"':
         - img
         - text: 删除