refactor: move rule editor actions into the navigation bar

- Both editor modes commit via a checkmark confirmation button
  (role: .confirm) in the navigation bar — accessibility labels
  'Add Rule' (create) and 'Done' (edit); replaces the bottom
  'Add Rule' button, so nothing floats over the form anymore
- Edit mode gains an ellipsis 'Rule Actions' menu next to the
  checkmark holding Disable/Enable Rule and destructive Delete Rule;
  the red form rows are removed
- Tests pin the checkmark to the navigation bar with its label and
  drive disable/delete through the menu; the swipe-to-reach
  workarounds are gone. 95 passing
- Spec §6 updated

SeveredUITests/RuleManagementUITests.swift

@@ -47,10 +47,12 @@ final class RuleManagementUITests: XCTestCase {
 
         app.buttons["ruleCard-Sleep"].waitToAppear().tap()
         app.buttons["editRuleButton"].waitToAppear().tap()
-        // The disable/delete rows sit at the bottom of the form.
-        app.staticTexts["ruleEditorTitle"].waitToAppear()
-        app.swipeUp()
-        app.buttons["toggleEnabledButton"].waitToAppear().tap()
+
+        // Disable lives in the ellipsis menu in the navigation bar.
+        let actionsMenu = app.navigationBars.buttons["ruleActionsMenu"].waitToAppear()
+        XCTAssertEqual(actionsMenu.label, "Rule Actions")
+        actionsMenu.tap()
+        app.buttons["Disable Rule"].waitToAppear().tap()
 
         // The detail caption now reports the rule as disabled.
         let status = app.staticTexts["detailStatusLabel"].waitToAppear()
@@ -66,10 +68,10 @@ final class RuleManagementUITests: XCTestCase {
 
         app.buttons["ruleCard-Sleep"].waitToAppear().tap()
         app.buttons["editRuleButton"].waitToAppear().tap()
-        // The disable/delete rows sit at the bottom of the form.
-        app.staticTexts["ruleEditorTitle"].waitToAppear()
-        app.swipeUp()
-        app.buttons["deleteRuleButton"].waitToAppear().tap()
+
+        // Delete lives in the ellipsis menu in the navigation bar.
+        app.navigationBars.buttons["ruleActionsMenu"].waitToAppear().tap()
+        app.buttons["Delete Rule"].waitToAppear().tap()
 
         app.buttons["newRuleButton"].waitToAppear()
         XCTAssertFalse(