Add Apple Watch app (TickTick-style) + midnight period notifications

WenzaWatch (new watchOS target, embed disabled until the watchOS platform is
installed — see project.yml note):
- Today list of actionable tasks (dated today/overdue + recurring occurrences),
  tap-to-complete with haptics, and add-via-dictation.
- Reads/writes the same tasks through the shared iCloud KV store that
  CloudSyncManager mirrors on the phone; watch entitlement uses the iOS app's
  kvstore identifier so they share one store. New tasks include all required
  TaskItem keys so the phone decodes them.
- NOTE: not compiled here (watchOS SDK absent on this machine); iOS build
  verified green with the embed commented out.

Period notifications: day/week/month/year now all fire at midnight (00:00),
adding the daily "One more day passed." (Pretty Progress style).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

KisaniCal.xcodeproj/xcshareddata/xcschemes/KisaniCal.xcscheme

@@ -1,10 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "2620"
-   version = "1.3">
+   LastUpgradeVersion = "1500"
+   version = "1.7">
    <BuildAction
       parallelizeBuildables = "YES"
-      buildImplicitDependencies = "YES">
+      buildImplicitDependencies = "YES"
+      runPostActionsOnFailure = "NO">
       <BuildActionEntries>
          <BuildActionEntry
             buildForTesting = "YES"
@@ -26,7 +27,8 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      shouldUseLaunchSchemeArgsEnv = "YES">
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      onlyGenerateCoverageForSpecifiedTargets = "NO">
       <MacroExpansion>
          <BuildableReference
             BuildableIdentifier = "primary"
@@ -38,6 +40,8 @@
       </MacroExpansion>
       <Testables>
       </Testables>
+      <CommandLineArguments>
+      </CommandLineArguments>
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"
@@ -59,6 +63,8 @@
             ReferencedContainer = "container:KisaniCal.xcodeproj">
          </BuildableReference>
       </BuildableProductRunnable>
+      <CommandLineArguments>
+      </CommandLineArguments>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"
@@ -76,6 +82,8 @@
             ReferencedContainer = "container:KisaniCal.xcodeproj">
          </BuildableReference>
       </BuildableProductRunnable>
+      <CommandLineArguments>
+      </CommandLineArguments>
    </ProfileAction>
    <AnalyzeAction
       buildConfiguration = "Debug">