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/bulk-import-prompt.tsx

@@ -28,9 +28,7 @@ export function BulkImportPrompt({
 				<div className="rounded-md border border-green-500/50 bg-green-500/10 px-3 py-2 text-sm text-green-400">
 					All sources loaded
 				</div>
-				<Button size="sm" onClick={onDone}>
-					Done
-				</Button>
+				<Button onClick={onDone}>Done</Button>
 			</div>
 		);
 	}
@@ -42,9 +40,7 @@ export function BulkImportPrompt({
 					Loaded {importState.completed}/{importState.total} sources (
 					{importState.failed} failed)
 				</div>
-				<Button size="sm" onClick={onDone}>
-					Done
-				</Button>
+				<Button onClick={onDone}>Done</Button>
 			</div>
 		);
 	}
@@ -103,11 +99,7 @@ export function BulkImportPrompt({
 				/>
 			</div>
 
-			<Button
-				size="sm"
-				onClick={() => onStartImport(baseUrl)}
-				disabled={isDisabled}
-			>
+			<Button onClick={() => onStartImport(baseUrl)} disabled={isDisabled}>
 				Load All
 			</Button>
 		</div>