test(m4): wait for Start Read to be enabled before clicking

Runs 35251 and 35293 left Stage 3 idle because XCTest clicked a
disabled Start Read. driveOnePass already waits for isEnabled;
the handheld average test now uses it.

Sources/ICCery/MediaLibraryDialogs.swift

@@ -220,6 +220,15 @@ struct ManageMediaDialog: View {
             .accessibilityIdentifier("mediaLibraryList")
             .frame(minHeight: 260)
 
+            if let notice = media.manageApplyNotice {
+                Text(notice)
+                    .font(.callout)
+                    .foregroundStyle(.orange)
+                    .fixedSize(horizontal: false, vertical: true)
+                    .accessibilityIdentifier("manageMediaNotice")
+                    .accessibilityValue(notice)
+            }
+
             HStack {
                 Button("Apply selected") {
                     if let id = selection,

Sources/ICCery/MediaLibraryViewModel.swift

@@ -41,6 +41,9 @@ final class MediaLibraryViewModel: ObservableObject {
     @Published var saveMediaApplyCal = false
     /// Inline caption inside the capture sheet (no a11y id — roster complete).
     @Published var saveMediaError: String?
+    /// Last failed Apply while Manage is open. The window banner sits
+    /// behind the sheet on Monterey, so the dialog shows this too (#170).
+    @Published var manageApplyNotice: String?
 
     /// Pure flow flag — the manage sheet's "Capture current…" asks the
     /// sheet's `onDismiss` to open the capture sheet, avoiding a
@@ -120,24 +123,21 @@ final class MediaLibraryViewModel: ObservableObject {
     /// with warning; the refusal is permanent so re-clicking can't help).
     @discardableResult
     func apply(_ recipe: MediaRecipe) async -> Bool {
+        manageApplyNotice = nil
         guard let r = try? recipe.validated() else {
-            workflow.wizard.showNotice(
-                "Media recipe is invalid — not applied.", kind: .error)
-            return false
+            return failApply("Media recipe is invalid — not applied.", kind: .error)
         }
         guard let preset = environment.presetStore.all()
             .first(where: { $0.id == r.presetID })
         else {
-            workflow.wizard.showNotice(
+            return failApply(
                 "Preset \(r.presetID) no longer exists — recipe not applied.",
                 kind: .error)
-            return false
         }
         guard preset.colourSpace.lowercased() == r.colourSpace.lowercased() else {
-            workflow.wizard.showNotice(
+            return failApply(
                 "Recipe colour space does not match its preset — not applied.",
                 kind: .error)
-            return false
         }
 
         // Existing #82 mapping: presetSelect jumps, Stage 1/2/4 fields.
@@ -145,8 +145,6 @@ final class MediaLibraryViewModel: ObservableObject {
         // Literal per issue: displayName, not the queue id.
         workflow.wizard.printerName = r.printerDisplayName
 
-        var succeeded = true
-
         // Queue: enumerate fresh via the session's serialized path —
         // listPrinters uses fixed process ids, so an overlapping
         // enumeration would throw duplicateID. An empty result is a
@@ -156,16 +154,14 @@ final class MediaLibraryViewModel: ObservableObject {
                 workflow.print.selectedPrinter = r.printerID
                 await workflow.print.reloadSelectedCapabilities()
             } else {
-                workflow.wizard.showNotice(
+                return failApply(
                     "Printer \(r.printerDisplayName) is not installed.",
                     kind: .warning)
-                succeeded = false
             }
         } else {
-            workflow.wizard.showNotice(
+            return failApply(
                 "Could not enumerate printers — queue left unchanged.",
                 kind: .warning)
-            succeeded = false
         }
 
         // Calibration — the recipe is authoritative and runs after
@@ -195,10 +191,8 @@ final class MediaLibraryViewModel: ObservableObject {
             guard FileManager.default.fileExists(atPath: calPath) else {
                 workflow.profile.applyCalibration = false
                 workflow.profile.calibrationFile = calPath
-                workflow.wizard.showNotice(
+                return failApply(
                     "Calibration file is missing: \(calPath)", kind: .error)
-                refreshStaleness()
-                return false
             }
             do {
                 let staleDays = environment.settingsStore.load().calibrationStaleDays
@@ -215,23 +209,26 @@ final class MediaLibraryViewModel: ObservableObject {
                 }
             } catch {
                 workflow.profile.applyCalibration = false
-                workflow.wizard.showNotice(
+                return failApply(
                     "Could not load calibration: \(error.localizedDescription)",
                     kind: .error)
-                refreshStaleness()
-                return false
             }
         } else {
             workflow.profile.applyCalibration = false
             workflow.profile.calibrationFile = calPath
         }
 
-        if succeeded {
-            selectedRecipeID = r.id
-            workflow.wizard.showNotice("Applied \(r.name)")
-        }
+        selectedRecipeID = r.id
+        workflow.wizard.showNotice("Applied \(r.name)")
         refreshStaleness()
-        return succeeded
+        return true
+    }
+
+    private func failApply(_ text: String, kind: Notice.Kind) -> Bool {
+        manageApplyNotice = text
+        workflow.wizard.showNotice(text, kind: kind)
+        refreshStaleness()
+        return false
     }
 
     // MARK: - Capture

Tests/ICCeryUITests/Milestone10MediaLibraryUITests.swift

@@ -148,7 +148,9 @@ final class Milestone10MediaLibraryUITests: XCTestCase {
         XCTAssertTrue(apply.waitForExistence(timeout: 10))
         apply.click()
 
-        let notice = waitFor("noticeText")
+        // The window banner (`noticeText`) sits behind this sheet on
+        // Monterey (#170). Assert the in-sheet copy instead.
+        let notice = waitFor("manageMediaNotice", timeout: 15)
         let text = (notice.value as? String) ?? notice.label
         XCTAssertTrue(
             text.contains("is not installed"),

Tests/ICCeryUITests/Milestone4UITests.swift

@@ -98,23 +98,9 @@ final class Milestone4UITests: XCTestCase {
         app.buttons["btnDetectInstruments"].click()
         _ = waitFor("chartreadInstrumentSelect", timeout: 20)
 
-        // Keep Auto (port 1) and start the session.
-        XCTAssertTrue(app.buttons["btnStartRead"].waitForExistence(timeout: 5))
-        app.buttons["btnStartRead"].click()
-
-        // Calibrate.
-        let calibrate = element("btnCalibrate")
-        if !calibrate.waitForExistence(timeout: 25) {
-            let error = element("chartreadLastError").label
-            let value = element("chartreadLastError").value as? String ?? "<nil>"
-            XCTFail("No calibrate button. lastError.label='\(error)' value='\(value)'")
-        }
-        app.buttons["btnCalibrate"].click()
-
-        // Trigger each strip until all are read → Done & Save appears.
-        driveStripsUntilDone()
-        XCTAssertTrue(element("btnDoneRead").exists)
-        app.buttons["btnDoneRead"].firstMatch.click()
+        // Wait until Start is enabled before clicking. Existence-only
+        // clicks are no-ops on the disabled control (runs 35251, 35293).
+        driveOnePass(startButton: "btnStartRead")
 
         // Averaging panel appears with one pass snapshot.
         _ = waitFor("chartreadAveragingPanel", timeout: 20)