feat(apple): streamline the Storage screen and fix stuck usage

Redesign the Storage screen for clarity: an "On this device" usage header with a
manual Refresh control, symbol-led action buttons, and a caption under each action
spelling out exactly what it does (Free up space = temp + trash, non-destructive;
Delete all transfers = clears history + cached share content, keeps received
files).

Fix the summary sticking on "Calculating…": it loaded only on .onAppear and bailed
when opened before the core finished its async launch, leaving the loading branch
showing with nothing running (only a manual refresh recovered it). loadStorageUsage
now waits for the core to become ready before reading usage, distinguishes a real
failure (retry) from loading, loads via .task, and can be refreshed on demand. Use
plain button styling with explicit tints so pressing an action no longer flips the
label to the white selection highlight.

apple/VniDrop/Features/Settings/SettingsSections.swift

@@ -78,61 +78,71 @@ struct StorageSettings: View {
 	@ObservedObject var model: SettingsModel
 	@State private var showDeleteConfirmation = false
 
+	private var isBusy: Bool {
+		model.state.isCalculatingStorage || model.state.isCleaningStorage || model.state.isDeletingTransfers
+	}
+
 	var body: some View {
 		Section {
-			if let storage = model.state.storage {
-				LabeledContent(String(localized: L10n.Storage.receivedFiles), value: formatBytes(storage.receivedFiles))
-				LabeledContent(String(localized: L10n.Storage.transferData), value: formatBytes(storage.transferCache))
-				LabeledContent(String(localized: L10n.Storage.appData), value: formatBytes(storage.appData))
-				LabeledContent(String(localized: L10n.Storage.temporary), value: formatBytes(storage.temporary))
-				LabeledContent(String(localized: L10n.Storage.total)) {
-					Text(formatBytes(storage.total)).fontWeight(.semibold)
-				}
-			} else {
-				HStack {
-					Text(String(localized: L10n.Storage.calculating)).foregroundStyle(.secondary)
-					Spacer()
-					ProgressView()
+			usageContent
+		} header: {
+			HStack {
+				Text(String(localized: L10n.Storage.usageHeader))
+				Spacer()
+				if model.state.isCalculatingStorage {
+					ProgressView().controlSize(.small)
+				} else {
+					Button(action: model.loadStorageUsage) {
+						Label(String(localized: L10n.Storage.refresh), systemSymbol: .arrowClockwise)
+							.labelStyle(.iconOnly)
+					}
+					.buttonStyle(.borderless)
+					.disabled(isBusy)
+					.help(String(localized: L10n.Storage.refresh))
 				}
 			}
 		} footer: {
 			Text(String(localized: L10n.Storage.footer))
 		}
 
+		// Reclaim reversible junk (temp + trash) — non-destructive to history.
 		Section {
-			Button {
-				model.freeUpSpace()
-			} label: {
-				HStack {
-					Text(model.state.isCleaningStorage
-						 ? String(localized: L10n.Storage.cleaning)
-						 : String(localized: L10n.Storage.freeUpSpace))
-					if model.state.isCleaningStorage {
-						Spacer()
-						ProgressView()
-					}
-				}
+			Button(action: model.freeUpSpace) {
+				actionLabel(
+					title: L10n.Storage.freeUpSpace,
+					busyTitle: L10n.Storage.cleaning,
+					isBusy: model.state.isCleaningStorage,
+					symbol: .sparkles,
+					tint: .accentColor
+				)
 			}
-			.disabled(model.state.isCleaningStorage)
+			// `.plain` so pressing the row dims the label instead of flipping it to
+			// the white selection-highlight that the default form button style uses.
+			.buttonStyle(.plain)
+			.disabled(isBusy)
+		} footer: {
+			Text(String(localized: L10n.Storage.freeUpSpaceCaption))
 		}
 
+		// Destructive: clears transfer history + cached share content.
 		Section {
-			Button(role: .destructive) {
+			Button {
 				showDeleteConfirmation = true
 			} label: {
-				HStack {
-					Text(model.state.isDeletingTransfers
-						 ? String(localized: L10n.Storage.deleting)
-						 : String(localized: L10n.Storage.deleteTransfers))
-					if model.state.isDeletingTransfers {
-						Spacer()
-						ProgressView()
-					}
-				}
+				actionLabel(
+					title: L10n.Storage.deleteTransfers,
+					busyTitle: L10n.Storage.deleting,
+					isBusy: model.state.isDeletingTransfers,
+					symbol: .trash,
+					tint: .red
+				)
 			}
-			.disabled(model.state.isDeletingTransfers)
+			.buttonStyle(.plain)
+			.disabled(isBusy)
+		} footer: {
+			Text(String(localized: L10n.Storage.deleteTransfersCaption))
 		}
-		.onAppear { model.loadStorageUsage() }
+		.task { model.loadStorageUsage() }
 		.confirmationDialog(
 			Text(String(localized: L10n.Storage.deleteTransfers)),
 			isPresented: $showDeleteConfirmation,
@@ -146,6 +156,53 @@ struct StorageSettings: View {
 			Text(String(localized: L10n.Storage.deleteTransfersDescription))
 		}
 	}
+
+	@ViewBuilder
+	private var usageContent: some View {
+		if let storage = model.state.storage {
+			LabeledContent(String(localized: L10n.Storage.receivedFiles), value: formatBytes(storage.receivedFiles))
+			LabeledContent(String(localized: L10n.Storage.transferData), value: formatBytes(storage.transferCache))
+			LabeledContent(String(localized: L10n.Storage.appData), value: formatBytes(storage.appData))
+			LabeledContent(String(localized: L10n.Storage.temporary), value: formatBytes(storage.temporary))
+			LabeledContent(String(localized: L10n.Storage.total)) {
+				Text(formatBytes(storage.total)).fontWeight(.semibold)
+			}
+		} else if model.state.storageLoadFailed {
+			// Genuine failure (core reported an error) — offer a retry.
+			Button(action: model.loadStorageUsage) {
+				Label(String(localized: L10n.Storage.unavailable), systemSymbol: .arrowClockwise)
+					.foregroundStyle(.secondary)
+			}
+			.buttonStyle(.plain)
+		} else {
+			// Loading, or waiting for the core to finish starting.
+			HStack {
+				Text(String(localized: L10n.Storage.calculating)).foregroundStyle(.secondary)
+				Spacer()
+				ProgressView().controlSize(.small)
+			}
+		}
+	}
+
+	/// A tinted, full-width button label with a leading symbol and a trailing
+	/// spinner while busy. `.contentShape` keeps the whole row tappable.
+	private func actionLabel(
+		title: String.LocalizationValue,
+		busyTitle: String.LocalizationValue,
+		isBusy: Bool,
+		symbol: SFSymbol,
+		tint: Color
+	) -> some View {
+		HStack {
+			Label(String(localized: isBusy ? busyTitle : title), systemSymbol: symbol)
+			Spacer()
+			if isBusy {
+				ProgressView().controlSize(.small)
+			}
+		}
+		.foregroundStyle(tint)
+		.contentShape(Rectangle())
+	}
 }
 
 struct AboutSettings: View {