web: keyboard shortcuts

web/README.md

@@ -40,6 +40,10 @@ Default dev URL: `http://localhost:5173`
 - Composer adapts to the active item:
   - Chat sends `POST /v1/chat-completions/stream` (SSE).
   - Search sends `POST /v1/searches/:searchId/run/stream` (SSE).
+- Keyboard shortcuts:
+  - `Cmd/Ctrl+J`: start a new chat.
+  - `Shift+Cmd/Ctrl+J`: start a new search.
+  - `Cmd/Ctrl+Up/Down`: move through the sidebar list.
 
 Client API contract docs:
 - `../docs/api/rest.md`

web/src/App.tsx

@@ -1008,6 +1008,10 @@ export default function App() {
     if (selectedSearchSummary) return `${getSearchTitle(selectedSearchSummary)} — Sybil`;
     return "Sybil";
   }, [draftKind, selectedChat, selectedChatSummary, selectedItem, selectedSearch, selectedSearchSummary]);
+  const primaryShortcutModifier = useMemo(() => {
+    if (typeof navigator === "undefined") return "Ctrl";
+    return /Mac|iPhone|iPad|iPod/i.test(navigator.platform) ? "Cmd" : "Ctrl";
+  }, []);
 
   useEffect(() => {
     document.title = pageTitle;
@@ -1035,6 +1039,56 @@ export default function App() {
     setIsMobileSidebarOpen(false);
   };
 
+  const selectAdjacentSidebarItem = (direction: -1 | 1) => {
+    if (!filteredSidebarItems.length) return;
+
+    setError(null);
+    setContextMenu(null);
+    setDraftKind(null);
+    setIsMobileSidebarOpen(false);
+    setSelectedItem((current) => {
+      const currentIndex = current
+        ? filteredSidebarItems.findIndex((item) => item.kind === current.kind && item.id === current.id)
+        : -1;
+      const fallbackIndex = direction > 0 ? 0 : filteredSidebarItems.length - 1;
+      const nextIndex =
+        currentIndex < 0
+          ? fallbackIndex
+          : Math.min(filteredSidebarItems.length - 1, Math.max(0, currentIndex + direction));
+      const nextItem = filteredSidebarItems[nextIndex];
+      return { kind: nextItem.kind, id: nextItem.id };
+    });
+  };
+
+  useEffect(() => {
+    if (!isAuthenticated) return;
+
+    const handleKeyDown = (event: KeyboardEvent) => {
+      const hasPrimaryModifier = event.metaKey || event.ctrlKey;
+      if (!hasPrimaryModifier || event.altKey) return;
+
+      const key = event.key.toLowerCase();
+      if (key === "j") {
+        event.preventDefault();
+        if (event.shiftKey) {
+          handleCreateSearch();
+        } else {
+          handleCreateChat();
+        }
+        focusComposer();
+        return;
+      }
+
+      if (event.key === "ArrowUp" || event.key === "ArrowDown") {
+        event.preventDefault();
+        selectAdjacentSidebarItem(event.key === "ArrowUp" ? -1 : 1);
+      }
+    };
+
+    window.addEventListener("keydown", handleKeyDown);
+    return () => window.removeEventListener("keydown", handleKeyDown);
+  }, [filteredSidebarItems, isAuthenticated]);
+
   const openContextMenu = (event: MouseEvent, item: SidebarSelection) => {
     event.preventDefault();
     const menuWidth = 160;
@@ -1632,10 +1686,16 @@ export default function App() {
             <Button className="h-11 w-full justify-start gap-3 text-[15px]" onClick={handleCreateChat}>
               <Plus className="h-4 w-4" />
               New chat
+              <span className="ml-auto rounded-md border border-violet-100/12 bg-white/5 px-1.5 py-0.5 text-[10px] font-semibold uppercase tracking-wide text-violet-100/52">
+                {primaryShortcutModifier} J
+              </span>
             </Button>
             <Button className="h-10 w-full justify-start gap-3" variant="secondary" onClick={handleCreateSearch}>
               <Search className="h-4 w-4" />
               New search
+              <span className="ml-auto rounded-md border border-violet-100/10 bg-white/[0.035] px-1.5 py-0.5 text-[10px] font-semibold uppercase tracking-wide text-violet-100/44">
+                Shift {primaryShortcutModifier} J
+              </span>
             </Button>
             <div className="relative">
               <Search className="pointer-events-none absolute left-3 top-1/2 h-4 w-4 -translate-y-1/2 text-violet-200/58" />