fix(web): only anchor presses dismiss the hover card

The card is a React child of the wrapper, so capture-phase presses on it
reached the wrapper's dismissal handler: the first pointerdown of a text
selection closed the card, contradicting its JSDoc contract. Restrict the
immediate close to presses outside the card, keeping it mounted under a
held press (and the browser click with it), and align onPointerLeave's
grace arming with Menu (only while open).

Pin both new behaviors in hover-card.spec and update the bilingual Agent
Note.

packages/client/ui-primitives/src/HoverCard.tsx

@@ -109,11 +109,17 @@ export function HoverCard({ anchor, content, openDelayMs = 500, disabled = false
       }}
       onPointerLeave={() => {
         clearTimer()
-        armClose()
+        // Leaving a closed card schedules a no-op close; only arm while
+        // open, matching Menu's shape.
+        if (open) armClose()
       }}
-      // Any press inside the anchor (row click, menu trigger) dismisses the
+      // A press inside the anchor (row click, menu trigger) dismisses the
       // card immediately, without waiting for the owner to flip `disabled`.
-      onPointerDownCapture={() => {
+      // Capture presses reach this handler from the card too — it is a React
+      // child of the wrapper — but a press there starts a selection, so the
+      // card must stay mounted under it (and the browser's click with it).
+      onPointerDownCapture={(e) => {
+        if (cardRef.current?.contains(e.target as Node)) return
         clearTimer()
         cancelClose()
         setOpen(false)

packages/client/ui-primitives/tests/hover-card.spec.tsx

@@ -108,6 +108,26 @@ describe('HoverCard', () => {
     expect(screen.queryByText('card body')).toBeNull()
   })
 
+  it('a press on the card starts a selection instead of dismissing it', () => {
+    // The card is a React child of the wrapper, so capture-phase presses on
+    // it reach the wrapper's dismissal handler too; they must not close it,
+    // or the first pointerdown of a text-selection drag would kill the card.
+    const { wrapper } = mount()
+    fireEvent.pointerEnter(wrapper)
+    act(() => { vi.advanceTimersByTime(500) })
+    fireEvent.pointerDown(screen.getByText('card body'))
+    // Still mounted after a grace's worth of time: no close was armed either.
+    act(() => { vi.advanceTimersByTime(POINTER_GRACE_MS) })
+    expect(screen.getByText('card body')).toBeTruthy()
+  })
+
+  it('a press while closed leaves the card closed', () => {
+    mount()
+    fireEvent.pointerDown(screen.getByText('row'))
+    act(() => { vi.advanceTimersByTime(1000) })
+    expect(screen.queryByText('card body')).toBeNull()
+  })
+
   it('disabled suppresses opening entirely', () => {
     const { wrapper } = mount({ disabled: true })
     fireEvent.pointerEnter(wrapper)