feat(21-03): remove slide-out panels from root layout and clean UIStore

- Remove Item and Candidate SlideOutPanel instances from __root.tsx
- Remove SlideOutPanel, ItemForm, CandidateForm imports from root
- Remove panel state (panelMode, editingItemId, candidatePanelMode, editingCandidateId) from UIStore
- Remove panel actions (openEditPanel, openAddPanel, closePanel, etc.) from UIStore
- Preserve currentThreadId derivation for CandidateDeleteDialog
- Update CollectionView empty state to use catalog search instead of add panel
- Update ItemForm/CandidateForm with onClose prop replacing store panel close
- Clean all dead panel references across src/client/

src/client/components/CandidateForm.tsx

@@ -1,7 +1,6 @@
 import { useEffect, useState } from "react";
 import { useCreateCandidate, useUpdateCandidate } from "../hooks/useCandidates";
 import { useThread } from "../hooks/useThreads";
-import { useUIStore } from "../stores/uiStore";
 import { CategoryPicker } from "./CategoryPicker";
 import { ImageUpload } from "./ImageUpload";
 
@@ -9,6 +8,7 @@ interface CandidateFormProps {
 	mode: "add" | "edit";
 	threadId: number;
 	candidateId?: number | null;
+	onClose?: () => void;
 }
 
 interface FormData {
@@ -39,11 +39,11 @@ export function CandidateForm({
 	mode,
 	threadId,
 	candidateId,
+	onClose,
 }: CandidateFormProps) {
 	const { data: thread } = useThread(threadId);
 	const createCandidate = useCreateCandidate(threadId);
 	const updateCandidate = useUpdateCandidate(threadId);
-	const closeCandidatePanel = useUIStore((s) => s.closeCandidatePanel);
 
 	const [form, setForm] = useState<FormData>(INITIAL_FORM);
 	const [errors, setErrors] = useState<Record<string, string>>({});
@@ -124,13 +124,13 @@ export function CandidateForm({
 			createCandidate.mutate(payload, {
 				onSuccess: () => {
 					setForm(INITIAL_FORM);
-					closeCandidatePanel();
+					onClose?.();
 				},
 			});
 		} else if (candidateId != null) {
 			updateCandidate.mutate(
 				{ candidateId, ...payload },
-				{ onSuccess: () => closeCandidatePanel() },
+				{ onSuccess: () => onClose?.() },
 			);
 		}
 	}

src/client/components/CollectionView.tsx

@@ -14,7 +14,7 @@ export function CollectionView() {
 	const { data: totals } = useTotals();
 	const { data: categories } = useCategories();
 	const { weight, price } = useFormatters();
-	const openAddPanel = useUIStore((s) => s.openAddPanel);
+	const openCatalogSearch = useUIStore((s) => s.openCatalogSearch);
 
 	const [searchText, setSearchText] = useState("");
 	const [categoryFilter, setCategoryFilter] = useState<number | null>(null);
@@ -66,7 +66,7 @@ export function CollectionView() {
 					</p>
 					<button
 						type="button"
-						onClick={openAddPanel}
+						onClick={() => openCatalogSearch("collection")}
 						className="inline-flex items-center gap-2 px-5 py-2.5 bg-gray-700 hover:bg-gray-800 text-white text-sm font-medium rounded-lg transition-colors"
 					>
 						<svg

src/client/components/ItemForm.tsx

@@ -7,6 +7,7 @@ import { ImageUpload } from "./ImageUpload";
 interface ItemFormProps {
 	mode: "add" | "edit";
 	itemId?: number | null;
+	onClose?: () => void;
 }
 
 interface FormData {
@@ -31,11 +32,10 @@ const INITIAL_FORM: FormData = {
 	imageFilename: null,
 };
 
-export function ItemForm({ mode, itemId }: ItemFormProps) {
+export function ItemForm({ mode, itemId, onClose }: ItemFormProps) {
 	const { data: items } = useItems();
 	const createItem = useCreateItem();
 	const updateItem = useUpdateItem();
-	const closePanel = useUIStore((s) => s.closePanel);
 	const openConfirmDelete = useUIStore((s) => s.openConfirmDelete);
 
 	const [form, setForm] = useState<FormData>(INITIAL_FORM);
@@ -112,13 +112,13 @@ export function ItemForm({ mode, itemId }: ItemFormProps) {
 			createItem.mutate(payload, {
 				onSuccess: () => {
 					setForm(INITIAL_FORM);
-					closePanel();
+					onClose?.();
 				},
 			});
 		} else if (itemId != null) {
 			updateItem.mutate(
 				{ id: itemId, ...payload },
-				{ onSuccess: () => closePanel() },
+				{ onSuccess: () => onClose?.() },
 			);
 		}
 	}

src/client/routes/__root.tsx

@@ -9,14 +9,11 @@ import {
 } from "@tanstack/react-router";
 import { useState } from "react";
 import "../app.css";
-import { CandidateForm } from "../components/CandidateForm";
 import { CatalogSearchOverlay } from "../components/CatalogSearchOverlay";
 import { ConfirmDialog } from "../components/ConfirmDialog";
 import { ExternalLinkDialog } from "../components/ExternalLinkDialog";
 import { FabMenu } from "../components/FabMenu";
-import { ItemForm } from "../components/ItemForm";
 import { OnboardingWizard } from "../components/OnboardingWizard";
-import { SlideOutPanel } from "../components/SlideOutPanel";
 import { TotalsBar } from "../components/TotalsBar";
 import { useAuth } from "../hooks/useAuth";
 import { useDeleteCandidate } from "../hooks/useCandidates";
@@ -79,16 +76,6 @@ function RootLayout() {
 	const { data: auth, isLoading: authLoading } = useAuth();
 	const isAuthenticated = !!auth?.user;
 
-	// Item panel state
-	const panelMode = useUIStore((s) => s.panelMode);
-	const editingItemId = useUIStore((s) => s.editingItemId);
-	const closePanel = useUIStore((s) => s.closePanel);
-
-	// Candidate panel state
-	const candidatePanelMode = useUIStore((s) => s.candidatePanelMode);
-	const editingCandidateId = useUIStore((s) => s.editingCandidateId);
-	const closeCandidatePanel = useUIStore((s) => s.closeCandidatePanel);
-
 	// Candidate delete state
 	const confirmDeleteCandidateId = useUIStore(
 		(s) => s.confirmDeleteCandidateId,
@@ -114,9 +101,6 @@ function RootLayout() {
 		!wizardDismissed &&
 		isAuthenticated;
 
-	const isItemPanelOpen = panelMode !== "closed";
-	const isCandidatePanelOpen = candidatePanelMode !== "closed";
-
 	// Route matching for contextual behavior
 	const matchRoute = useMatchRoute();
 
@@ -186,40 +170,6 @@ function RootLayout() {
 			<TotalsBar {...finalTotalsProps} />
 			<Outlet />
 
-			{/* Item Slide-out Panel */}
-			<SlideOutPanel
-				isOpen={isItemPanelOpen}
-				onClose={closePanel}
-				title={panelMode === "add" ? "Add Item" : "Edit Item"}
-			>
-				{panelMode === "add" && <ItemForm mode="add" />}
-				{panelMode === "edit" && (
-					<ItemForm mode="edit" itemId={editingItemId} />
-				)}
-			</SlideOutPanel>
-
-			{/* Candidate Slide-out Panel */}
-			{currentThreadId != null && (
-				<SlideOutPanel
-					isOpen={isCandidatePanelOpen}
-					onClose={closeCandidatePanel}
-					title={
-						candidatePanelMode === "add" ? "Add Candidate" : "Edit Candidate"
-					}
-				>
-					{candidatePanelMode === "add" && (
-						<CandidateForm mode="add" threadId={currentThreadId} />
-					)}
-					{candidatePanelMode === "edit" && (
-						<CandidateForm
-							mode="edit"
-							threadId={currentThreadId}
-							candidateId={editingCandidateId}
-						/>
-					)}
-				</SlideOutPanel>
-			)}
-
 			{/* Item Confirm Delete Dialog */}
 			<ConfirmDialog />
 

src/client/routes/threads/$threadId.tsx

@@ -23,7 +23,7 @@ function ThreadDetailPage() {
 	const { threadId: threadIdParam } = Route.useParams();
 	const threadId = Number(threadIdParam);
 	const { data: thread, isLoading, isError } = useThread(threadId);
-	const openCandidateAddPanel = useUIStore((s) => s.openCandidateAddPanel);
+	const [_showAddCandidate, setShowAddCandidate] = useState(false);
 	const candidateViewMode = useUIStore((s) => s.candidateViewMode);
 	const setCandidateViewMode = useUIStore((s) => s.setCandidateViewMode);
 	const selectedSetupId = useUIStore((s) => s.selectedSetupId);
@@ -132,7 +132,7 @@ function ThreadDetailPage() {
 				{isActive && (
 					<button
 						type="button"
-						onClick={openCandidateAddPanel}
+						onClick={() => setShowAddCandidate(true)}
 						className="inline-flex items-center gap-2 px-4 py-2 bg-gray-700 hover:bg-gray-800 text-white text-sm font-medium rounded-lg transition-colors"
 					>
 						<svg

src/client/stores/uiStore.ts

@@ -1,25 +1,15 @@
 import { create } from "zustand";
 
 interface UIState {
-	// Item panel state
-	panelMode: "closed" | "add" | "edit";
-	editingItemId: number | null;
+	// Item delete state
 	confirmDeleteItemId: number | null;
 
-	openAddPanel: () => void;
-	openEditPanel: (itemId: number) => void;
-	closePanel: () => void;
 	openConfirmDelete: (itemId: number) => void;
 	closeConfirmDelete: () => void;
 
-	// Candidate panel state
-	candidatePanelMode: "closed" | "add" | "edit";
-	editingCandidateId: number | null;
+	// Candidate delete state
 	confirmDeleteCandidateId: number | null;
 
-	openCandidateAddPanel: () => void;
-	openCandidateEditPanel: (id: number) => void;
-	closeCandidatePanel: () => void;
 	openConfirmDeleteCandidate: (id: number) => void;
 	closeConfirmDeleteCandidate: () => void;
 
@@ -70,28 +60,15 @@ interface UIState {
 }
 
 export const useUIStore = create<UIState>((set) => ({
-	// Item panel
-	panelMode: "closed",
-	editingItemId: null,
+	// Item delete
 	confirmDeleteItemId: null,
 
-	openAddPanel: () => set({ panelMode: "add", editingItemId: null }),
-	openEditPanel: (itemId) => set({ panelMode: "edit", editingItemId: itemId }),
-	closePanel: () => set({ panelMode: "closed", editingItemId: null }),
 	openConfirmDelete: (itemId) => set({ confirmDeleteItemId: itemId }),
 	closeConfirmDelete: () => set({ confirmDeleteItemId: null }),
 
-	// Candidate panel
-	candidatePanelMode: "closed",
-	editingCandidateId: null,
+	// Candidate delete
 	confirmDeleteCandidateId: null,
 
-	openCandidateAddPanel: () =>
-		set({ candidatePanelMode: "add", editingCandidateId: null }),
-	openCandidateEditPanel: (id) =>
-		set({ candidatePanelMode: "edit", editingCandidateId: id }),
-	closeCandidatePanel: () =>
-		set({ candidatePanelMode: "closed", editingCandidateId: null }),
 	openConfirmDeleteCandidate: (id) => set({ confirmDeleteCandidateId: id }),
 	closeConfirmDeleteCandidate: () => set({ confirmDeleteCandidateId: null }),