feat: re-skin to native three-tab UI and add Uninstall Protection

Replace the custom themed presentation with the bare native iOS design
language across a three-tab TabView (Home / Rules / Settings):

- MainTabView hosts the enforcement lifecycle (refresh loop, rule-change
  and scene-active reconcile) so it runs regardless of the selected tab
- HomeView: "Currently Blocking" + "Usage" sections (replaces AppsHomeView)
- RulesListView: rules grouped into Schedule / Time Limit / Open Limit
- SettingsView: Uninstall Protection toggle + Manage App Lists
- AppListLibraryView / ManageAppListsView: shared App List management
- AppSettings: app-group-backed settings store

Uninstall Protection: while enabled and any Hard Mode rule is actively
blocking, deny device app-removal via a dedicated ManagedSettingsStore
(RulePolicy.shouldDenyAppRemoval -> RuleEnforcer -> ShieldController).

Slim AppListPickerSheet to the picker role; drop AppsHomeView and the
custom Theme/HoldToCommitButton/RuleCardView chrome. Update spec section 6
and the unit/UI test suites accordingly.

OpenAppLockUITests/RuleManagementUITests.swift

@@ -7,6 +7,7 @@ import XCTest
 
 /// Detail sheet, editing, disabling, deleting, and unblocking — seeded with
 /// one actively-blocking rule ("Work Time") and one upcoming rule ("Sleep").
+/// Rule cards live on the Rules tab; blocked tiles on the Home tab.
 final class RuleManagementUITests: XCTestCase {
     override func setUpWithError() throws {
         continueAfterFailure = false
@@ -14,6 +15,7 @@ final class RuleManagementUITests: XCTestCase {
 
     func testDetailShowsLiveStatusAndFacts() throws {
         let app = XCUIApplication.launchOpenAppLock(seedScenario: "standard")
+        app.goToRulesTab()
 
         app.buttons["ruleCard-Work Time"].waitToAppear().tap()
 
@@ -30,6 +32,7 @@ final class RuleManagementUITests: XCTestCase {
 
     func testEditRuleTogglesHardModeOn() throws {
         let app = XCUIApplication.launchOpenAppLock(seedScenario: "standard")
+        app.goToRulesTab()
 
         app.buttons["ruleCard-Sleep"].waitToAppear().tap()
         app.buttons["editRuleButton"].waitToAppear().tap()
@@ -44,6 +47,7 @@ final class RuleManagementUITests: XCTestCase {
 
     func testDisableRule() throws {
         let app = XCUIApplication.launchOpenAppLock(seedScenario: "standard")
+        app.goToRulesTab()
 
         app.buttons["ruleCard-Sleep"].waitToAppear().tap()
         app.buttons["editRuleButton"].waitToAppear().tap()
@@ -65,6 +69,7 @@ final class RuleManagementUITests: XCTestCase {
 
     func testDeleteRuleRemovesCard() throws {
         let app = XCUIApplication.launchOpenAppLock(seedScenario: "standard")
+        app.goToRulesTab()
 
         app.buttons["ruleCard-Sleep"].waitToAppear().tap()
         app.buttons["editRuleButton"].waitToAppear().tap()
@@ -84,11 +89,13 @@ final class RuleManagementUITests: XCTestCase {
     func testUnblockActiveSoftRule() throws {
         let app = XCUIApplication.launchOpenAppLock(seedScenario: "standard")
 
-        // The active rule surfaces in Blocked Apps; unblocking pauses it.
+        // The active rule surfaces in Currently Blocking (Home tab); unblocking pauses it.
         app.buttons["blockedTile-Work Time"].waitToAppear().tap()
         app.sheets.buttons["Unblock"].waitToAppear().tap()
 
         app.staticTexts["nothingBlockedLabel"].waitToAppear()
+        // The paused state shows on the rule's card over on the Rules tab.
+        app.goToRulesTab()
         XCTAssertEqual(app.staticTexts["ruleStatus-Work Time"].waitToAppear().label, "Paused")
     }
 }
@@ -101,6 +108,7 @@ final class HardModeUITests: XCTestCase {
 
     func testHardLockedRuleCannotBeEdited() throws {
         let app = XCUIApplication.launchOpenAppLock(seedScenario: "hard-mode-active")
+        app.goToRulesTab()
 
         app.buttons["ruleCard-Locked In"].waitToAppear().tap()
 
@@ -113,6 +121,8 @@ final class HardModeUITests: XCTestCase {
     func testHardLockedRuleCannotBeUnblocked() throws {
         let app = XCUIApplication.launchOpenAppLock(seedScenario: "hard-mode-active")
 
+        // The hard rule shows a lock (not an Unblock button) in Currently Blocking;
+        // tapping the row still explains why it can't be lifted.
         app.buttons["blockedTile-Locked In"].waitToAppear().tap()
 
         // No unblock dialog — just the refusal alert.