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.

OpenAppLockTests/RuleEnforcerTests.swift

@@ -269,3 +269,71 @@ struct OverlappingRuleEnforcementTests {
         #expect(shields.shieldedRuleIDs == [rule.id])
     }
 }
+
+/// Uninstall Protection: `refresh` denies device app removal only while the
+/// user opted in *and* a Hard Mode rule is actively blocking.
+@MainActor
+@Suite("Uninstall protection enforcement")
+struct UninstallProtectionEnforcementTests {
+    let mondayDuringWork = date(2025, 1, 6, 10, 0)  // inside the default 09:00–17:00
+    let mondayEvening = date(2025, 1, 6, 19, 0)     // outside it
+
+    private func hardRule() -> BlockingRule {
+        BlockingRule(name: "Locked In", hardMode: true)
+    }
+
+    @Test("Disabled setting never denies app removal")
+    func disabledSettingNeverDenies() {
+        let shields = MockShieldController()
+        let enforcer = RuleEnforcer(
+            shields: shields, settings: MockAppSettings(uninstallProtectionEnabled: false))
+
+        enforcer.refresh(rules: [hardRule()], at: mondayDuringWork, calendar: utc)
+
+        #expect(!shields.appRemovalDenied)
+    }
+
+    @Test("Enabled setting denies removal while a hard rule is blocking")
+    func deniesDuringHardBlock() {
+        let shields = MockShieldController()
+        let enforcer = RuleEnforcer(
+            shields: shields, settings: MockAppSettings(uninstallProtectionEnabled: true))
+
+        enforcer.refresh(rules: [hardRule()], at: mondayDuringWork, calendar: utc)
+
+        #expect(shields.appRemovalDenied)
+    }
+
+    @Test("A soft rule does not deny removal even with the setting on")
+    func softRuleDoesNotDeny() {
+        let shields = MockShieldController()
+        let enforcer = RuleEnforcer(
+            shields: shields, settings: MockAppSettings(uninstallProtectionEnabled: true))
+
+        enforcer.refresh(rules: [BlockingRule(name: "Work Time")], at: mondayDuringWork, calendar: utc)
+
+        #expect(!shields.appRemovalDenied)
+    }
+
+    @Test("Denial lifts once the hard window ends")
+    func liftsWhenWindowEnds() {
+        let shields = MockShieldController()
+        let enforcer = RuleEnforcer(
+            shields: shields, settings: MockAppSettings(uninstallProtectionEnabled: true))
+        let rule = hardRule()
+
+        enforcer.refresh(rules: [rule], at: mondayDuringWork, calendar: utc)
+        #expect(shields.appRemovalDenied)
+
+        enforcer.refresh(rules: [rule], at: mondayEvening, calendar: utc)
+        #expect(!shields.appRemovalDenied)
+    }
+
+    @Test("clearShields(except:) does not disturb the app-removal denial")
+    func clearShieldsPreservesDenial() {
+        let shields = MockShieldController()
+        shields.setAppRemovalDenied(true)
+        shields.clearShields(except: [])
+        #expect(shields.appRemovalDenied)
+    }
+}