Migrate icon buttons to Button component and simplify size variants

Replace raw <button> elements with Button variant="ghost" in stat-block
panel, toast, player modals. Add icon-sm size variant (h-6 w-6) for
compact contexts. Consolidate text button sizes into a single default
(h-8 px-3), removing the redundant sm variant. Add size prop to
ConfirmButton for consistent sizing.

Button now has three sizes: default (text), icon, icon-sm.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/components/stat-block-panel.tsx

@@ -8,6 +8,7 @@ import { useSwipeToDismiss } from "../hooks/use-swipe-to-dismiss.js";
 import { BulkImportPrompt } from "./bulk-import-prompt.js";
 import { SourceFetchPrompt } from "./source-fetch-prompt.js";
 import { StatBlock } from "./stat-block.js";
+import { Button } from "./ui/button.js";
 
 interface StatBlockPanelProps {
 	creatureId: CreatureId | null;
@@ -81,36 +82,39 @@ function PanelHeader({
 		<div className="flex items-center justify-between border-b border-border px-4 py-2">
 			<div className="flex items-center gap-1">
 				{panelRole === "browse" && (
-					<button
-						type="button"
+					<Button
+						variant="ghost"
+						size="icon-sm"
 						onClick={onToggleFold}
-						className="text-muted-foreground hover:text-hover-neutral"
+						className="text-muted-foreground"
 						aria-label="Fold stat block panel"
 					>
 						<PanelRightClose className="h-4 w-4" />
-					</button>
+					</Button>
 				)}
 			</div>
 			<div className="flex items-center gap-1">
 				{panelRole === "browse" && showPinButton && (
-					<button
-						type="button"
+					<Button
+						variant="ghost"
+						size="icon-sm"
 						onClick={onPin}
-						className="text-muted-foreground hover:text-hover-neutral"
+						className="text-muted-foreground"
 						aria-label="Pin creature"
 					>
 						<Pin className="h-4 w-4" />
-					</button>
+					</Button>
 				)}
 				{panelRole === "pinned" && (
-					<button
-						type="button"
+					<Button
+						variant="ghost"
+						size="icon-sm"
 						onClick={onUnpin}
-						className="text-muted-foreground hover:text-hover-neutral"
+						className="text-muted-foreground"
 						aria-label="Unpin creature"
 					>
 						<PinOff className="h-4 w-4" />
-					</button>
+					</Button>
 				)}
 			</div>
 		</div>
@@ -195,14 +199,15 @@ function MobileDrawer({
 				{...handlers}
 			>
 				<div className="flex items-center justify-between border-b border-border px-4 py-2">
-					<button
-						type="button"
+					<Button
+						variant="ghost"
+						size="icon-sm"
 						onClick={onDismiss}
-						className="text-muted-foreground hover:text-hover-neutral"
+						className="text-muted-foreground"
 						aria-label="Fold stat block panel"
 					>
 						<PanelRightClose className="h-4 w-4" />
-					</button>
+					</Button>
 				</div>
 				<div className="h-[calc(100%-41px)] overflow-y-auto p-4">
 					{children}