fix(ui-question): stop option rows absorbing the capped card's shortfall

The question composer card is capped against the viewport and scrolls its
option list. `.options` is a flex column whose children defaulted to
`flex-shrink: 1`, so a short seat shrank the rows before overflowing the
scroll container: a row collapsed to its 42px minimum while `.optionCopy`
kept the taller height its wrapped copy needs, and `align-items: center`
then painted that copy outside the row's border box — over the question
title above and the next row below. Measured 6.5px of spill at 900x440 on
the shipped client, 10px at 380px tall, with `.options` reporting
scrollHeight === clientHeight and therefore offering no scrollbar.

`.option` and `.custom` now declare `flex-shrink: 0`, so the shortfall
reaches the scroll container that already owns `overflow-y: auto` — the
behavior the cap was designed for. Only rows whose copy wraps could
reproduce this, which is why the recorded scenario now asks a question
with long option descriptions; the web e2e asserts at three squeezed seat
heights that every row's children stay inside its border box, guarded
against holding vacuously by requiring a wrapped row and a scrolling list.

apps/web/tests/question-composer.e2e.ts

@@ -28,7 +28,10 @@ const UI_EXPECTED = join(SNAPSHOT_DIR, 'ui.expected.md')
 const ANSWERED_EXPECTED = join(SNAPSHOT_DIR, 'answered.expected.md')
 const MODE = webSnapshotMode()
 
-const PROMPT = 'Use the ask_user_question tool to ask me exactly one question with id "color", question "Which color do you prefer?", header "Pick one", and options labeled "Blue" and "Green". After I answer, reply with the single word DONE and stop.'
+// The options carry long descriptions on purpose: the squeeze assertion below
+// needs option copy that WRAPS, which is the only shape that reproduces a
+// collapsed row painting its copy outside its own box.
+const PROMPT = 'Use the ask_user_question tool to ask me exactly one question with id "color", question "Which color do you prefer?", header "Pick one", and two options: label "Blue" with description "A cool recessive hue that reads as calm and trustworthy in long reading sessions and dense dashboards.", and label "Green" with description "A restful mid-spectrum hue with the highest perceived brightness, easiest on the eye over long sessions." After I answer, reply with the single word DONE and stop.'
 
 describe('web e2e: resident question composer round trip', () => {
   let scaffold: WebScaffold
@@ -79,6 +82,48 @@ describe('web e2e: resident question composer round trip', () => {
       await compareOrRefreshGolden(UI_EXPECTED, snapshot, MODE)
     }
 
+    // Squeezed card: the option rows are the capped card's scroll content, so
+    // shrinking the seat must push overflow into the option list, never
+    // collapse a row below the height its own copy needs — a collapsed row
+    // paints its centered copy outside the row box, over the title and the
+    // neighbouring rows. Measured on the live composer at seat heights that
+    // force the cap, then restored for the answer gesture below. Replay only:
+    // record mode must reach the recording write below, not abort on layout.
+    if (MODE !== 'record') {
+      const original = page.viewportSize() ?? { width: 1680, height: 1000 }
+      for (const height of [520, 440, 380]) {
+        await page.setViewportSize({ width: 900, height })
+        const squeeze = await composer.evaluate((card) => {
+          // Role/ARIA selectors, not the CSS-module class names: the built
+          // client hashes those.
+          const rows = [...card.querySelectorAll<HTMLElement>(
+            '[role="radio"], [role="checkbox"], [aria-expanded]',
+          )]
+          const spill = rows.map(row => Math.max(...[...row.children].map((child) => {
+            const box = row.getBoundingClientRect()
+            const inner = child.getBoundingClientRect()
+            return Math.max(box.top - inner.top, inner.bottom - box.bottom)
+          })))
+          const list = rows[0]?.parentElement ?? null
+          return {
+            rows: rows.length,
+            spill: Math.max(...spill),
+            // Wrapped copy is the shape that overflows a collapsed row, and a
+            // scrolling list proves the seat is genuinely capped. Without both,
+            // the spill assertion would hold vacuously.
+            wrappedRows: rows.filter(row => row.getBoundingClientRect().height > 42).length,
+            scrolls: list === null ? false : list.scrollHeight > list.clientHeight,
+          }
+        })
+        expect(squeeze.rows).toBeGreaterThan(0)
+        expect(squeeze.wrappedRows).toBeGreaterThan(0)
+        expect(squeeze.scrolls).toBe(true)
+        // Sub-pixel tolerance: every row's copy stays inside its border box.
+        expect(squeeze.spill).toBeLessThan(0.6)
+      }
+      await page.setViewportSize(original)
+    }
+
     await composer.getByRole('radio', { name: 'Blue' }).click()
     // Submit: Enter on the focused option (the composer's documented submit).
     await composer.getByRole('radio', { name: 'Blue' }).press('Enter')

apps/web/tests/snapshots/question-composer/answered.expected.md

@@ -6,18 +6,18 @@
     - tab "Chat" [selected]
     - tab "Trajectory"
     - tab "Waterfall"
-- text: Use the ask_user_question tool to ask me exactly one question with id "color", question "Which color do you prefer?", header "Pick one", and options labeled "Blue" and "Green". After I answer, reply with the single word DONE and stop.
-- button "Think The user wants me to use the ask_user_question tool to ask a specific question with id \"color\", question \"Which color do you prefer?\", header \"Pick one\", and options labeled \"Blue\" and \"Green\". Let me do exactly that.":
+- text: "Use the ask_user_question tool to ask me exactly one question with id \"color\", question \"Which color do you prefer?\", header \"Pick one\", and two options: label \"Blue\" with description \"A cool recessive hue that reads as calm and trustworthy in long reading sessions and dense dashboards.\", and label \"Green\" with description \"A restful mid-spectrum hue with the highest perceived brightness, easiest on the eye over long sessions.\" After I answer, reply with the single word DONE and stop."
+- button "Think The user wants me to use the ask_user_question tool with specific parameters. Let me do exactly that.":
   - img
-  - text: Think The user wants me to use the ask_user_question tool to ask a specific question with id "color", question "Which color do you prefer?", header "Pick one", and options labeled "Blue" and "Green". Let me do exactly that.
+  - text: Think The user wants me to use the ask_user_question tool with specific parameters. Let me do exactly that.
 - button:
   - img
-- text: "Tool call ask_user_question · {\"questions\": [{\"id\": \"color\", \"question\": \"Which color do you prefer?\", \"header\": \"Pick one\", \"options\": [{\"label\": \"Blue\"}, {\"label\": \"Green\"}]}]}"
-- button "Think The user answered \"Blue\". I need to reply with the single word DONE and stop.":
+- text: "Tool call ask_user_question · {\"questions\": [{\"id\": \"color\", \"question\": \"Which color do you prefer?\", \"header\": \"Pick one\", \"options\": [{\"label\": \"Blue\", \"description\": \"A cool recessive hue that reads as calm and trustworthy in long reading sessions and dense dashboards.\"}, {\"label\": \"Green\", \"description\": \"A restful mid-spectrum hue with the highest perceived brightness, easiest on the eye over long sessions.\"}]}]}"
+- button "Think The user answered \"Blue\". I should now reply with the single word DONE and stop.":
   - img
-  - text: Think The user answered "Blue". I need to reply with the single word DONE and stop.
+  - text: Think The user answered "Blue". I should now reply with the single word DONE and stop.
 - paragraph: DONE
-- text: cache hit 99% · 15,978 tokens · 1 turns · 2 steps
+- text: cache hit 95% · 8,769 tokens · 1 turns · 2 steps
 - textbox "Message the agent"
 - button "Add attachment":
   - img

apps/web/tests/snapshots/question-composer/session.jsonl

@@ -1,31 +1,31 @@
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+{"type":"assistant/chunk","seq":162,"time":1785150170856,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":163,"time":1785150170857,"data":{"turn":1,"step":2,"content":[{"type":"reasoning","text":"The user answered \"Blue\". I should now reply with the single word DONE and stop."},{"type":"text","text":"DONE"}],"provenance":{"provider":"deepseek","model":"deepseek-v4-flash"},"usage":{"inputTokens":284,"outputTokens":22,"cacheReadTokens":4096,"reasoningTokens":19}},"sourceEventSeqs":[136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162],"surfaceOp":"append"}
+{"type":"step/end","seq":164,"time":1785150170858,"data":{"turn":1,"step":2}}
+{"type":"turn/end","seq":165,"time":1785150170858,"data":{"turn":1,"reason":{"kind":"completed"}}}

apps/web/tests/snapshots/question-composer/ui.expected.md

@@ -10,10 +10,10 @@
     - img
   - radiogroup:
     - radio "Blue":
-      - text: 1 Blue
+      - text: 1 Blue A cool recessive hue that reads as calm and trustworthy in long reading sessions and dense dashboards.
       - img
     - radio "Green":
-      - text: 2 Green
+      - text: 2 Green A restful mid-spectrum hue with the highest perceived brightness, easiest on the eye over long sessions.
       - img
     - button "其他，请填写自定义答案":
       - img