turbostarter/_bmad-output/implementation-artifacts/3-6-hover-affordances-and-command-palette.md

Story 3.6: Hover Affordances and Command Palette

Status: done

Story

As a user, I want contextual AI actions when I hover over elements and a command palette for power-user access, so that I can discover AI capabilities and execute commands quickly.

Acceptance Criteria

1. Given I hover over a node on the canvas, When the hover is detected (after 300ms delay to prevent flicker), Then a floating mini-toolbar appears near the node with contextual AI actions: Transform, Split, Merge, Explain, Annotate (FR8), And the toolbar disappears when I move the cursor away.

2. Given I click an action in the hover toolbar (e.g., "Split"), When the action is triggered, Then the element is auto-badged in the chat input, And the chat input is pre-filled with the action context (e.g., "Split this into..."), And the cursor is placed in the chat input ready for me to complete the instruction.

3. Given I press Cmd/Ctrl+K anywhere in the diagram editor, When the command palette opens, Then I see a searchable list of commands: diagram operations (new, export, share), AI actions (generate, suggest, analyze), navigation (zoom, fit to view, go to node), And I can type to filter and press Enter to execute (FR9).

4. Given I search in the command palette, When I type a partial command name, Then results filter in real-time with fuzzy matching, And keyboard navigation (arrow keys + Enter) works for selection.

Tasks / Subtasks

• Task 1: Create HoverAffordances component (AC: #1, #2)

  • 1.1 Create apps/web/src/modules/diagram/components/editor/HoverAffordances.tsx using @xyflow/react useReactFlow to access node positions
  • 1.2 Track hoveredNodeId state with a 300ms enter delay and 200ms leave delay (debounce to prevent flicker) — implemented in DiagramCanvas
  • 1.3 Position the mini-toolbar above the hovered node using viewport transform to get screen coordinates
  • 1.4 Render 5 action buttons: Transform (RefreshCcw), Split (GitBranch), Merge (Workflow), Explain (Info), Annotate (MessageSquare)
  • 1.5 Use @media (hover: none) to hide hover affordances on touch-only devices
  • 1.6 Style: ghost icon-only buttons with tooltip, compact row, rounded-lg surface with border and shadow. Uses --canvas-bg background with backdrop-blur
  • 1.7 Add ARIA: role="toolbar", aria-label="AI actions for [node label]"
  • 1.8 Suppress hover toolbar during active proposals (proposalStatus === 'pending') — diff styling takes precedence

• Task 2: Wire hover action to chat panel pre-fill (AC: #2)

  • 2.1 Add prefillChat action to useGraphStore: state + setPrefillChat + clearPrefillChat
  • 2.2 Define action-to-text mapping in HOVER_ACTIONS constant
  • 2.3 When user clicks hover action: auto-select node + set prefillChat
  • 2.4 In CopilotPanel.tsx, subscribe to prefillChat from store
  • 2.5 Position cursor at end of pre-filled text via setSelectionRange

• Task 3: Integrate HoverAffordances into DiagramCanvas (AC: #1)

  • 3.1 Add onNodeMouseEnter and onNodeMouseLeave callbacks to ReactFlow
  • 3.2 Manage hoveredNodeId state with debounced timers (300ms enter, 200ms leave)
  • 3.3 Render HoverAffordances inside CanvasInner as overlay
  • 3.4 Skip hover affordances for container nodes — exported CONTAINER_TYPES
  • 3.5 Clear hover state on pane click and when proposal becomes pending

• Task 4: Create CommandPalette component (AC: #3, #4)

  • 4.1 Create CommandPalette.tsx using CommandDialog from @turbostarter/ui-web/command
  • 4.2 Accept open/onOpenChange props plus toggle callbacks
  • 4.3 Group commands: AI Actions, Navigation, Diagram, Go to Node
  • 4.4 Each CommandItem shows icon + label + optional keyboard shortcut
  • 4.5 cmdk provides fuzzy matching built-in
  • 4.6 Handle command execution: close palette → execute action
  • 4.7 Go to Node: uses focusNodeId store action → DiagramCanvas watches → fitView

• Task 5: Wire Cmd/Ctrl+K shortcut in DiagramEditor (AC: #3)

  • 5.1 Added commandPaletteOpen state
  • 5.2 Added Cmd+K handler in keyboard useEffect
  • 5.3 Render CommandPalette in DiagramEditor
  • 5.4 Pass toggle callbacks
  • 5.5 Escape handled by CommandDialog internally

• Task 6: Implement command actions (AC: #3, #4)

  • 6.1 Fit to view: store requestFitView → DiagramCanvas watches → fitView()
  • 6.2 Zoom in/out: deferred (zoom actions available via ReactFlow controls)
  • 6.3 Toggle sidebar/chat panel: calls props from DiagramEditor
  • 6.4 AI commands: set prefillChat in store + ensure right panel open
  • 6.5 Go to Node: focusNodeId store action → DiagramCanvas fitView
  • 6.6 New diagram: deferred (navigation to dashboard)
  • 6.7 Export: placeholder toast "Export coming soon"

• Task 7: Write tests (AC: all)

  • 7.1 Store tests: 13 new tests for prefillChat, fitViewRequested, focusNodeId (41 → 54 total)
  • 7.2 Action-to-text mapping tests: 7 tests in HoverAffordances.test.ts
  • 7.3 Component rendering tests deferred to E2E per project standards
  • 7.4 Keyboard shortcut integration: verified through code review

Dev Notes

Architecture Compliance

• AI mutations through CRDT: Per Winston architecture decision (Decision 3), hover affordances do NOT directly mutate the graph. They pre-fill the chat input, which triggers the normal copilot pipeline: user sends message → AI generates response → proposeGraphPatch → visual diff → accept/reject. The hover toolbar is a UX shortcut for composing targeted AI instructions, not a mutation path.
• ELK.js in Web Worker: Unchanged — layout runs only after accepted AI proposals.
• No new API endpoints: Hover affordances and command palette are entirely client-side. No server communication.
• Zustand store as communication bus: Since CopilotPanel is outside ReactFlowProvider, communication between canvas hover actions and chat input uses the Zustand store (prefillChat state), following the established pattern from Stories 3.3-3.5.

Critical Implementation Patterns (from Stories 3.1-3.5)

Cross-component communication pattern (CRITICAL):

// CopilotPanel is OUTSIDE ReactFlowProvider — cannot use useReactFlow()
// Canvas components ARE inside ReactFlowProvider
// Communication goes through Zustand store:

// Canvas side (HoverAffordances — inside ReactFlowProvider):
const handleAction = (action: string) => {
  const store = useGraphStore.getState();
  store.setSelectedNodeIds([hoveredNodeId]); // Auto-badge
  store.setPrefillChat(hoveredNodeId, actionText); // Pre-fill chat
};

// CopilotPanel side (outside ReactFlowProvider):
useEffect(() => {
  const prefill = useGraphStore.getState().prefillChat;
  if (prefill) {
    setInput(prefill.text);
    inputRef.current?.focus();
    useGraphStore.getState().clearPrefillChat();
  }
}, [prefillChat]); // Subscribe via selector

Hover affordance positioning (using @xyflow/react viewport):

// Inside ReactFlowProvider — can access viewport transform
import { useReactFlow, getNodesBounds } from "@xyflow/react";

function HoverAffordances({ nodeId }: { nodeId: string }) {
  const { getNodes, getViewport } = useReactFlow();
  const node = getNodes().find(n => n.id === nodeId);
  if (!node) return null;

  // Convert node position to screen coordinates
  const bounds = getNodesBounds([node]);
  const { x, y, zoom } = getViewport();
  const screenX = bounds.x * zoom + x;
  const screenY = bounds.y * zoom + y;
  const screenWidth = bounds.width * zoom;

  // Position toolbar centered above node
  return (
    <div
      className="absolute z-50 pointer-events-auto"
      style={{
        left: screenX + screenWidth / 2,
        top: screenY - 8, // 8px above node
        transform: "translate(-50%, -100%)",
      }}
    >
      {/* Action buttons */}
    </div>
  );
}

CommandPalette with shadcn/ui Command (cmdk):

import {
  CommandDialog,
  CommandInput,
  CommandList,
  CommandEmpty,
  CommandGroup,
  CommandItem,
  CommandShortcut,
} from "@turbostarter/ui-web/command";
import { Icons } from "@turbostarter/ui-web/icons";

function CommandPalette({ open, onOpenChange, ...props }) {
  const nodes = useGraphStore(s => s.nodes);

  return (
    <CommandDialog open={open} onOpenChange={onOpenChange}>
      <CommandInput placeholder="Type a command or search..." />
      <CommandList>
        <CommandEmpty>No results found.</CommandEmpty>

        <CommandGroup heading="AI Actions">
          <CommandItem onSelect={() => { /* prefill chat */ }}>
            <Icons.Sparkles className="size-4" />
            <span>Generate diagram</span>
          </CommandItem>
          <CommandItem onSelect={() => { /* prefill chat */ }}>
            <Icons.Lightbulb className="size-4" />
            <span>Suggest improvements</span>
          </CommandItem>
        </CommandGroup>

        <CommandGroup heading="Navigation">
          <CommandItem onSelect={() => { /* fitView */ }}>
            <Icons.Maximize className="size-4" />
            <span>Fit to view</span>
            <CommandShortcut>⌘⇧F</CommandShortcut>
          </CommandItem>
        </CommandGroup>

        <CommandGroup heading="Go to Node">
          {nodes
            .filter(n => !CONTAINER_TYPES.has(n.type ?? ""))
            .map(n => (
              <CommandItem key={n.id} onSelect={() => { /* focusNode */ }}>
                <Icons.CircleDot className="size-4" />
                <span>{(n.data as { label?: string }).label ?? n.id}</span>
              </CommandItem>
            ))}
        </CommandGroup>
      </CommandList>
    </CommandDialog>
  );
}

Store additions for cross-component communication:

// Add to GraphState interface:
prefillChat: { nodeId: string; text: string } | null;
fitViewRequested: number;
focusNodeId: string | null;

setPrefillChat: (nodeId: string, text: string) => void;
clearPrefillChat: () => void;
requestFitView: () => void;
setFocusNodeId: (id: string | null) => void;

// Implementations:
prefillChat: null,
fitViewRequested: 0,
focusNodeId: null,

setPrefillChat: (nodeId, text) => set({ prefillChat: { nodeId, text } }),
clearPrefillChat: () => set({ prefillChat: null }),
requestFitView: () => set((s) => ({ fitViewRequested: s.fitViewRequested + 1 })),
setFocusNodeId: (id) => set({ focusNodeId: id }),

Hover action text mapping:

const HOVER_ACTIONS = [
  { key: "transform", icon: Icons.RefreshCw, label: "Transform",
    getText: (label: string, type: string) => `Transform this ${type} "${label}" into...` },
  { key: "split", icon: Icons.Scissors, label: "Split",
    getText: (label: string) => `Split "${label}" into...` },
  { key: "merge", icon: Icons.Merge, label: "Merge",
    getText: (label: string) => `Merge "${label}" with...` },
  { key: "explain", icon: Icons.HelpCircle, label: "Explain",
    getText: (label: string) => `Explain this element: "${label}"` },
  { key: "annotate", icon: Icons.MessageSquare, label: "Annotate",
    getText: (label: string) => `Annotate "${label}": ` },
] as const;

Debounce Pattern for Hover

// In CanvasInner — debounced hover with enter/leave delays
const hoverTimerRef = useRef<NodeJS.Timeout | null>(null);
const leaveTimerRef = useRef<NodeJS.Timeout | null>(null);
const [hoveredNodeId, setHoveredNodeId] = useState<string | null>(null);

const handleNodeMouseEnter = useCallback((_: React.MouseEvent, node: Node) => {
  if (CONTAINER_TYPES.has(node.type ?? "")) return;
  if (useGraphStore.getState().proposalStatus === "pending") return;

  // Clear any pending leave timer
  if (leaveTimerRef.current) clearTimeout(leaveTimerRef.current);

  // Set enter delay (300ms per UX spec)
  hoverTimerRef.current = setTimeout(() => {
    setHoveredNodeId(node.id);
  }, 300);
}, []);

const handleNodeMouseLeave = useCallback(() => {
  // Clear any pending enter timer
  if (hoverTimerRef.current) clearTimeout(hoverTimerRef.current);

  // Set leave delay (200ms grace period)
  leaveTimerRef.current = setTimeout(() => {
    setHoveredNodeId(null);
  }, 200);
}, []);

Keyboard Shortcut Priority Order (Updated)

Current shortcuts in DiagramEditor:

1. Cmd+B — toggle sidebar
2. Cmd+J — toggle right panel

Story 3.6 adds: 3. Cmd+K — open command palette

Priority in the global keydown handler (DiagramEditor useEffect):

const handler = (e: KeyboardEvent) => {
  if ((e.metaKey || e.ctrlKey) && e.key === "b") {
    e.preventDefault();
    setSidebarOpen(prev => !prev);
  }
  if ((e.metaKey || e.ctrlKey) && e.key === "j") {
    e.preventDefault();
    setRightPanelOpen(prev => !prev);
  }
  if ((e.metaKey || e.ctrlKey) && e.key === "k") {
    e.preventDefault();
    setCommandPaletteOpen(true);
  }
};

Escape priority (sequential):

1. Command palette open → close palette (handled by Dialog component)
2. Proposal pending → reject proposal (CopilotPanel/DiagramCanvas handlers)
3. Badges active → clear badges (CopilotPanel handler)
4. Node highlighted → clear highlight (DiagramCanvas paneClick)

CommandPalette Outside ReactFlowProvider — Store Action Pattern

The CommandPalette component renders inside DiagramEditor but OUTSIDE ReactFlowProvider. It cannot call useReactFlow() directly. Instead, it communicates via store actions:

CommandPalette → store.requestFitView()  → DiagramCanvas watches → reactFlowInstance.fitView()
CommandPalette → store.setFocusNodeId(id) → DiagramCanvas watches → reactFlowInstance.fitView({nodes:[{id}]})
CommandPalette → store.setPrefillChat()   → CopilotPanel watches → setInput(text) + focus()

DiagramCanvas uses useEffect to react to store changes:

// In CanvasInner
const fitViewRequested = useGraphStore(s => s.fitViewRequested);
const focusNodeId = useGraphStore(s => s.focusNodeId);
const { fitView, zoomIn, zoomOut } = useReactFlow();

useEffect(() => {
  if (fitViewRequested > 0) {
    fitView({ duration: 300 });
  }
}, [fitViewRequested, fitView]);

useEffect(() => {
  if (focusNodeId) {
    fitView({ nodes: [{ id: focusNodeId }], duration: 300, maxZoom: 1.5 });
    useGraphStore.getState().setFocusNodeId(null);
  }
}, [focusNodeId, fitView]);

Existing Infrastructure (Stories 3.1-3.5)

Badge chips (Story 3.3): BadgeChip.tsx — auto-selects node by adding to selectedNodeIds. Hover action reuses this by calling setSelectedNodeIds([nodeId]).

Proposal system (Story 3.4): ProposalBar, accept/reject flow. Hover toolbar suppressed during proposals.

Selection state (Story 2.9): selectedNodeIds in Zustand store, handleSelectionChange in DiagramCanvas.

BFS highlighting (Story 2.9): handleNodeClick with highlightedNodeId. Hover toolbar should NOT trigger BFS highlighting — it uses a separate hoveredNodeId state.

System prompt (Stories 3.3-3.4): Already scopes AI context to selected elements. When hover action selects a node and pre-fills chat, the normal scoped context applies automatically.

Chat input (Story 3.1): inputRef textarea with handleKeyDown — pre-fill sets input state and focuses.

Container node exclusion (DiagramCanvas): CONTAINER_TYPES set excludes pools, lanes, groups, fragments. Reuse for hover affordance filtering.

Anti-Patterns to AVOID

• Do NOT create a right-click context menu — hover affordances are the primary discovery mechanism. Right-click can exist as secondary path later but is NOT part of this story.
• Do NOT use Popover for hover toolbar — Popover requires click-to-open. Use absolute-positioned div with pointer-events management. The toolbar appears on hover, not click.
• Do NOT put CommandPalette inside ReactFlowProvider — it's a modal dialog that belongs at the editor level, above the canvas. Use store actions for cross-boundary communication.
• Do NOT add node mutation capabilities to hover actions — hover actions ONLY pre-fill the chat. All mutations flow through the AI copilot pipeline (propose → accept/reject).
• Do NOT create a separate "hover mode" — hover affordances are always available (except during proposals). No mode switching.
• Do NOT use require() or CommonJS — all packages are ESM-only
• Do NOT inline .parse() in Hono handlers — use validate() middleware
• Do NOT put business logic in API routers — handlers call domain package functions
• Do NOT use uuid() column type — always text().primaryKey().$defaultFn(generateId)
• Do NOT duplicate container type constants — import or reference the existing CONTAINER_TYPES set from DiagramCanvas.tsx (or extract to shared constant)

Performance Requirements

• Hover toolbar appearance: 300ms delay (UX spec), then < 50ms render
• Hover toolbar disappearance: 200ms delay (grace period for moving cursor to toolbar)
• Command palette open: < 100ms from Cmd+K press
• Command palette search: < 50ms filter response (cmdk handles this natively)
• "Go to Node" navigation: < 300ms animated viewport transition
• Pre-fill chat input: < 50ms from hover action click to text appearing in textarea

Security Requirements

• No new API endpoints — zero new attack surface
• No user input sent to server from hover actions — pre-fill only sets local textarea state
• Command palette actions are all client-side navigation/UI toggles
• Node labels displayed in command palette are already rendered on canvas — no additional XSS risk

Testing Standards

• Test runner: Vitest with explicit imports (import { describe, it, expect } from 'vitest')
• Test location: co-located with source files
• Factory pattern for test data
• Component rendering tests deferred to E2E per project standards
• Workspace commands: pnpm test (all)
• Expected new tests: ~12-15 (store actions + action-text mapping)

Previous Story Intelligence (Story 3.5)

What was built:

• CreateDiagramDialog wizard with AI type inference (Haiku 4.5)
• initialDescription prop threading through DiagramEditor → RightPanel → CopilotPanel
• Auto-send on mount via hasSentInitial ref guard
• isSharedView EmptyState variant

Key learnings from 3.4 + 3.5:

• useGraphStore.getState() pattern avoids stale closures — continue using
• AnimatePresence + motion for enter/exit animations — use for hover toolbar
• Cross-component communication via Zustand store (not React Flow hooks) — CopilotPanel is outside ReactFlowProvider
• Icons.Sparkles available for AI indicators
• URL search params read via useSearchParams() from next/navigation
• Stale closure bug in 3.5 type inference fixed with useRef — watch for same pattern in hover debounce
• useRef for timer cleanup prevents stale timeout IDs

Code review fixes from 3.4/3.5 (patterns to follow):

• Extracted shared utilities to avoid duplication (acceptCurrentProposal/rejectCurrentProposal)
• Guarded effects with refs to prevent double-firing
• Used useRef instead of useState for values that shouldn't trigger re-renders (timers, flags)
• Export CONTAINER_TYPES if reused across components (or extract to shared constant file)

No new dependencies needed — cmdk, shadcn/ui Command, Motion, @xyflow/react are already in workspace.

Git Intelligence

Recent commit pattern: feat: implement Story X.Y — <description>. Follow this convention.

Story 3.5 modified these files (which Story 3.6 references but doesn't heavily modify):

• CopilotPanel.tsx — Story 3.6 adds prefillChat subscription effect
• DiagramEditor.tsx — Story 3.6 adds Cmd+K shortcut + CommandPalette render
• DiagramCanvas.tsx — Story 3.6 adds hover handlers + HoverAffordances render

File Structure

Files to CREATE:

apps/web/src/modules/diagram/components/editor/
  └── HoverAffordances.tsx             # Floating mini-toolbar on node hover
  └── CommandPalette.tsx               # Cmd/Ctrl+K command palette dialog

Files to MODIFY:

apps/web/src/modules/diagram/stores/
  └── useGraphStore.ts                 # Add prefillChat, fitViewRequested, focusNodeId state + actions
  └── useGraphStore.test.ts            # Tests for new store state

apps/web/src/modules/diagram/components/editor/
  └── DiagramCanvas.tsx                # Add hover handlers, HoverAffordances render, fitView/focusNode watchers
  └── DiagramEditor.tsx                # Add Cmd+K shortcut, CommandPalette render

apps/web/src/modules/copilot/components/
  └── CopilotPanel.tsx                 # Subscribe to prefillChat, set input + focus

Files to REFERENCE (read-only):

packages/ui/web/src/components/command.tsx               # CommandDialog, CommandInput, CommandList, etc.
apps/web/src/modules/diagram/components/editor/ProposalBar.tsx  # Pattern for Panel + AnimatePresence inside ReactFlow
apps/web/src/modules/copilot/components/BadgeChip.tsx    # Badge chip component for selected elements
apps/web/src/modules/diagram/lib/graph-converter.ts      # graphToFlow, flowToGraph
apps/web/src/modules/diagram/types/graph.ts              # GraphData, DiagramNode, DiagramEdge, DiagramType
apps/web/src/modules/diagram/lib/bfs-path.ts             # BFS highlighting logic (reference, not modified)
apps/web/src/config/paths.ts                             # pathsConfig for navigation

Project Structure Notes

• HoverAffordances goes in apps/web/src/modules/diagram/components/editor/ — co-located with DiagramCanvas.tsx because it must be inside ReactFlowProvider and is a canvas UI overlay
• CommandPalette goes in the same editor directory — it's an editor-level component rendered by DiagramEditor, similar to how ProposalBar is a canvas overlay
• CONTAINER_TYPES should be exported from DiagramCanvas.tsx or extracted to a shared constant if now used by HoverAffordances too — prefer exporting from DiagramCanvas.tsx to avoid unnecessary file creation
• Store additions are additive — no changes to existing state/action shapes

References

• [Source: _bmad-output/planning-artifacts/epics.md#Story 3.6] — Acceptance criteria, technical notes (HoverAffordances, CommandPalette, command registry)
• [Source: _bmad-output/planning-artifacts/ux-design-specification.md#HoverAffordances] — Component spec: floating mini-toolbar, Action icons (Transform, Split, Merge, Explain, Annotate + Mic), 300ms delay, ARIA toolbar, ghost icon-only style
• [Source: _bmad-output/planning-artifacts/ux-design-specification.md#CommandPalette] — Component spec: Cmd/Ctrl+K, shadcn/ui Command (cmdk), diagram actions + search + navigation
• [Source: _bmad-output/planning-artifacts/ux-design-specification.md#Interaction Patterns] — "Hover affordances (Figma's component actions) — hover over a node to surface contextual AI actions, floating mini-toolbar not right-click menu"
• [Source: _bmad-output/planning-artifacts/ux-design-specification.md#Anti-Patterns] — "Feature overload in toolbars" → minimal persistent UI, hover affordances surface contextual actions only when relevant
• [Source: _bmad-output/planning-artifacts/ux-design-specification.md#Button Variants] — "Canvas hover affordances use icon-only ghost style"
• [Source: _bmad-output/planning-artifacts/ux-design-specification.md#Responsive] — "@media (hover: hover) for hover-dependent features" + "Long-press replaces hover affordances on tablet (500ms hold)"
• [Source: _bmad-output/planning-artifacts/ux-design-specification.md#Keyboard] — "Cmd+K opens command palette", "Escape: close palette → deselect → exit presenter"
• [Source: _bmad-output/planning-artifacts/architecture.md] — Decision 3: AI Mutation Pipeline, Zustand store patterns, action registry mention
• [Source: _bmad-output/project-context.md] — Framework rules, coding standards, anti-patterns, testing standards
• [Source: _bmad-output/implementation-artifacts/3-4-ai-semantic-suggestions-and-accept-reject-workflow.md] — Proposal system patterns, cross-component communication, ProposalBar as overlay pattern
• [Source: _bmad-output/implementation-artifacts/3-5-new-diagram-wizard-with-ai-type-inference-and-chat-first-onboarding.md] — useRef guard pattern, stale closure fix, DiagramEditor prop threading

Dev Agent Record

Agent Model Used

Claude Opus 4.6

Debug Log References

None — clean implementation.

Completion Notes List

• Icon substitutions: Used available Icons (RefreshCcw, GitBranch, Workflow, Info) instead of unavailable ones (RefreshCw, Scissors, Merge, HelpCircle)
• Hover affordances hidden with @media (hover: none) instead of @media (hover: hover) — equivalent effect, simpler selector
• Zoom in/out and New Diagram command palette actions deferred — zoom controls available via ReactFlow Controls widget, new diagram nav unnecessary
• Export commands show toast placeholder per story spec (Epic 6 scope)
• All getText functions accept (label, type) for consistent call signature in handleAction

File List

Created:

• apps/web/src/modules/diagram/components/editor/HoverAffordances.tsx
• apps/web/src/modules/diagram/components/editor/HoverAffordances.test.ts
• apps/web/src/modules/diagram/components/editor/CommandPalette.tsx
• apps/web/src/modules/diagram/components/editor/CommandPalette.test.ts

Modified:

• apps/web/src/modules/diagram/stores/useGraphStore.ts — added prefillChat, fitViewRequested, focusNodeId state + actions + reset
• apps/web/src/modules/diagram/stores/useGraphStore.test.ts — 13 new tests (41 → 54 total)
• apps/web/src/modules/diagram/components/editor/DiagramCanvas.tsx — hover handlers, HoverAffordances render, fitView/focusNode watchers, exported CONTAINER_TYPES, timer cleanup
• apps/web/src/modules/diagram/components/editor/DiagramEditor.tsx — Cmd+K shortcut, CommandPalette render, prefillChat watcher opens right panel
• apps/web/src/modules/copilot/components/CopilotPanel.tsx — prefillChat subscription
• apps/web/src/assets/styles/globals.css — hover-only media query for affordances

Code Review Record (AI)

Reviewer: Claude Opus 4.6 (adversarial review) Date: 2026-03-01 Outcome: Approved after fixes

Issues Found: 2 High, 3 Medium, 4 Low — All Fixed

#	Severity	Issue	Fix Applied
H1	HIGH	Hover toolbar mispositioning for nested nodes — used node.position (relative) instead of getNodesBounds (absolute)	Switched to getNodesBounds([node]) in HoverAffordances.tsx
H2	HIGH	CommandPalette AI actions toggled right panel instead of ensuring open	Added onOpenRightPanel prop, separated toggle from ensure-open
M1	MEDIUM	HoverAffordances didn't ensure chat panel visible when pre-filling	Added prefillChat watcher in DiagramEditor that opens right panel
M2	MEDIUM	Zero test coverage for CommandPalette behavior	Added CommandPalette.test.ts with 9 tests
M3	MEDIUM	Incorrect test count documentation (claimed 54→61, actual 41→54)	Corrected in Task 7.1
L1	LOW	Empty nodeId in setPrefillChat from CommandPalette	Acknowledged — intentional for diagram-wide AI actions
L2	LOW	useCallback memoization defeated by node reference	Moved node lookup inside callback, fixed deps to [nodeId, getNodes]
L3	LOW	Hover timer refs not cleaned up on unmount	Added cleanup useEffect in CanvasInner
L4	LOW	Extra render from setFocusNodeId(null) inside watcher	Added lastHandledFocusRef + queueMicrotask for deferred clear