feat(dsh-plugin-browserskill): reskin the overlay with BrowserSkill's own UI system

The previous pass aligned the observation overlay with the dsh shell; the
product call is the opposite direction — the floating card should read as a
BrowserSkill surface, not a shell-native widget.

- Reuse @browser-skill/ui directly (Button, cn); status dots spec'd after the
  extension popup's ConnectionStatusIndicator; Remix icons for
  interrupt/pin/warn/pop-out.
- Compile the BSK tailwind utility sheet scoped under the .bsk-obs root class
  (scripts/build-client-css.mjs + postcss-prefix-selector) and ship the oklch
  design tokens on the same scope, so nothing leaks into the host shell and
  the shell theme cannot bleed back. tsdown injects .nomodule.css verbatim
  (minified, unhashed) alongside the hashed CSS modules.
- BSK ships no shared tooltip, so the one-time interrupt semantics hint is a
  card-spec bubble (bg-card/border/12px radius), retired after first use.
- Tests: pin react/react-dom to this package's 18.x copies in vitest — the ui
  package sources peer on react ^19 and would otherwise emit react-19
  (transitional) elements that the react-18 renderer rejects. Production is
  unaffected (react stays external, provided by the shell).
- stylelint: ignore the generated bsk-ui.nomodule.css.

packages/dsh-plugin-browserskill/src/client/ObservationOverlay.tsx

@@ -3,19 +3,31 @@
 // composer's way); collapsed = a status capsule; "pop out" upgrades the same
 // content to a native Document PiP window (user gesture required by the
 // browser). Multi-session renders a meeting-style strip under the focus view.
-// Visuals ride dsh's shared primitives and --dsw-alias-* tokens throughout,
-// so the card reads as a native part of the shell, not a foreign widget.
+// Visuals follow the BrowserSkill product family: @browser-skill/ui components
+// and oklch tokens on a .bsk-obs scope root, so the card reads as BSK's own
+// surface without leaking styles into (or inheriting themes from) the shell.
+
+import { Button, cn } from "@browser-skill/ui";
+import {
+  RiArrowDownSLine,
+  RiErrorWarningLine,
+  RiPictureInPicture2Line,
+  RiPushpinFill,
+  RiStopMiniFill,
+} from "@remixicon/react";
+
+// remixicon's component types target @types/react 19 while the dsh shell
+// runs react 18 — a compile-time-only recast keeps the 18 typecheck happy.
+type IconComponent = (props: { size?: number | string; className?: string }) => ReactNode;
+const asIcon = (component: unknown): IconComponent => component as IconComponent;
+const IconStop = asIcon(RiStopMiniFill);
+const IconPip = asIcon(RiPictureInPicture2Line);
+const IconDown = asIcon(RiArrowDownSLine);
+const IconWarn = asIcon(RiErrorWarningLine);
+const IconPin = asIcon(RiPushpinFill);
 
 import {
-  Button,
-  IconChevronDownOutline14,
-  IconRightUpOutline16,
-  IconStopFill16,
-  IconWarningOutline16,
-  StateDot,
-  Tooltip,
-} from "@deepseek-ai/dsh-client-ui-primitives";
-import {
+  type ReactNode,
   type PointerEvent as ReactPointerEvent,
   useCallback,
   useEffect,
@@ -94,19 +106,23 @@ export function statusOf(obs: SessionObservation): "active" | "idle" | "error" {
   return obs.action === "idle" ? "idle" : "active";
 }
 
-function dotStateOf(
-  state: "active" | "idle" | "error" | "dead",
-): "done" | "ongoing" | "error" | "warning" {
-  switch (state) {
-    case "active":
-      return "ongoing";
-    case "error":
-      return "error";
-    case "dead":
-      return "warning";
-    default:
-      return "done";
-  }
+/** Flat status dot, specced after the BSK popup's ConnectionStatusIndicator. */
+function StatusDot({ state }: { state: "active" | "idle" | "error" | "dead" }) {
+  const color =
+    state === "active"
+      ? "bg-emerald-500"
+      : state === "error"
+        ? "bg-red-500"
+        : state === "dead"
+          ? "bg-amber-500"
+          : "bg-muted-foreground/40";
+  return (
+    <span
+      className={cn("size-2 shrink-0 rounded-full ring-2 ring-background", color)}
+      data-state={state}
+      aria-hidden
+    />
+  );
 }
 
 /** One strip item: mini frame, id, status dot, hover interrupt, pin toggle. */
@@ -149,21 +165,8 @@ function StripItem(props: {
           )}
         </span>
         <span className={css["strip-id"]}>{obs.sessionId}</span>
-        <StateDot state={dotStateOf(state)} />
-        {pinned ? (
-          <svg
-            className={css["pin-badge"]}
-            width="9"
-            height="9"
-            viewBox="0 0 10 10"
-            aria-label="pinned"
-          >
-            <path
-              d="M6.5 0.8 9.2 3.5 8.3 4.4 7.9 4 6.2 6.9 6.6 8.7 6 9.4 3.4 5.4 1 7.9 0.6 7.3 2.5 6 3.1 6.6 5.9 2.1 5.5 1.7Z"
-              fill="currentColor"
-            />
-          </svg>
-        ) : null}
+        <StatusDot state={state} />
+        {pinned ? <IconPin size={9} className={css["pin-badge"]} aria-label="pinned" /> : null}
       </button>
       {hover && !pinned && obs.dead !== true ? (
         <button
@@ -176,7 +179,7 @@ function StripItem(props: {
             void store.interrupt(obs.sessionId);
           }}
         >
-          <IconStopFill16 size={8} />
+          <IconStop size={9} />
         </button>
       ) : null}
     </div>
@@ -211,7 +214,8 @@ function OverlayBody(props: {
     onHeaderPointerDown,
   } = props;
   const [interrupting, setInterrupting] = useState(false);
-  // One-time semantics hint: a shared Tooltip that retires after first use.
+  // One-time semantics hint bubble, retired after the first interrupt.
+  const [hintOpen, setHintOpen] = useState(false);
   const [hintSeen, setHintSeen] = useState(false);
 
   const thumbId = focus?.thumbnailAttachmentId;
@@ -241,14 +245,14 @@ function OverlayBody(props: {
   const state = !available ? "error" : focus !== undefined ? statusOf(focus) : "idle";
 
   return (
-    <div className={css.body} data-state={state} data-in-pip={inPip || undefined}>
+    <div className={cn(css.body, "bsk-obs")} data-state={state} data-in-pip={inPip || undefined}>
       <div
         className={css.header}
         data-testid="obs-header"
         onPointerDown={onHeaderPointerDown}
         role="presentation"
       >
-        <StateDot state={state === "error" ? "error" : state === "active" ? "ongoing" : "done"} />
+        <StatusDot state={state === "error" ? "error" : state === "active" ? "active" : "idle"} />
         <span className={css["status-text"]}>{statusText}</span>
         {onCollapse !== undefined ? (
           <button
@@ -257,7 +261,7 @@ function OverlayBody(props: {
             aria-label="Collapse"
             onClick={onCollapse}
           >
-            <IconChevronDownOutline14 />
+            <IconDown size={14} />
           </button>
         ) : null}
       </div>
@@ -280,7 +284,7 @@ function OverlayBody(props: {
         )}
         {thumb?.status === "error" ? (
           <span className={css.badge} aria-label="thumbnail failed">
-            <IconWarningOutline16 size={12} />
+            <IconWarn size={12} />
           </span>
         ) : null}
       </div>
@@ -299,34 +303,41 @@ function OverlayBody(props: {
         </div>
       ) : null}
       <div className={css.actions}>
-        <Tooltip
-          label="Interrupt stops only the current browser action — the agent run continues (use the chat Stop button to halt the run)."
-          side="top"
-          maxWidth={240}
-          disabled={hintSeen}
+        <span
+          className={css["interrupt-wrap"]}
+          onPointerEnter={() => {
+            if (!hintSeen) setHintOpen(true);
+          }}
+          onPointerLeave={() => setHintOpen(false)}
         >
-          <span className={css["interrupt-wrap"]}>
-            <Button
-              variant="outline"
-              size="sm"
-              className={css.interrupt}
-              icon={<IconStopFill16 />}
-              disabled={!canInterrupt}
-              aria-label="Interrupt the current browser action"
-              onClick={onInterrupt}
-            >
-              {interrupting ? "Interrupting…" : "Interrupt"}
-            </Button>
-          </span>
-        </Tooltip>
+          <Button
+            variant="outline"
+            size="sm"
+            className="text-destructive border-destructive/60 hover:bg-destructive/10"
+            disabled={!canInterrupt}
+            aria-label="Interrupt the current browser action"
+            onClick={onInterrupt}
+          >
+            <IconStop size={14} />
+            {interrupting ? "Interrupting…" : "Interrupt"}
+          </Button>
+          {/* BSK ships no shared tooltip component; this bubble follows the BSK
+              card spec (bg-card, border, 12px radius, caption text). */}
+          {hintOpen && !hintSeen ? (
+            <span className={css.hint} role="tooltip">
+              Interrupt stops only the current browser action — the agent run continues (use the
+              chat Stop button to halt the run).
+            </span>
+          ) : null}
+        </span>
         {onPopOut !== undefined ? (
           <Button
             variant="ghost"
             size="sm"
-            icon={<IconRightUpOutline16 />}
             aria-label="Pop out into a mini window"
             onClick={onPopOut}
           >
+            <IconPip size={14} />
             Pop out
           </Button>
         ) : null}
@@ -457,12 +468,12 @@ export function ObservationOverlay({ store }: { store: ObservationClientStore })
     return (
       <button
         type="button"
-        className={css.capsule}
+        className={cn(css.capsule, "bsk-obs")}
         data-state={state}
         aria-label="Expand browser observation overlay"
         onClick={() => setCollapsed(false)}
       >
-        <StateDot state={dotStateOf(state)} />
+        <StatusDot state={state} />
         <span className={css["capsule-text"]}>
           {snapshot.sessions.length} session{snapshot.sessions.length === 1 ? "" : "s"}
           {focus !== undefined && focus.action !== "idle"
@@ -478,7 +489,7 @@ export function ObservationOverlay({ store }: { store: ObservationClientStore })
       ? { left: pos.x, top: pos.y, width: size.w, height: size.h }
       : { right: EDGE_MARGIN, top: TOP_OFFSET, width: size.w, height: size.h };
   return (
-    <div className={css.card} style={style} data-obs-card data-testid="obs-card">
+    <div className={cn(css.card, "bsk-obs")} style={style} data-obs-card data-testid="obs-card">
       {body}
       <div
         className={css["resize-handle"]}