feat: TypeWhisper Flow sessions, Phase 4 UX, and GitHub Pages privacy site

Migrate keyboard dictation to continuous Flow sessions with auto-start,
tap-to-toggle recording, 60s countdown, five-step onboarding, and App Group
IPC. Add docs/ GitHub Pages site with en/zh privacy policy for App Store compliance.

OSGKeyboardShared/Utilities/DictationTextComposer.swift

@@ -0,0 +1,17 @@
+// DictationTextComposer.swift
+// OSGKeyboard · Shared
+//
+// Merges pre-dictation anchor text with a live cumulative transcript.
+
+import Foundation
+
+public enum DictationTextComposer {
+    /// Combine text that existed before dictation with the current live transcript.
+    public static func compose(anchor: String, live: String) -> String {
+        let trimmed = live.trimmingCharacters(in: .whitespacesAndNewlines)
+        guard !trimmed.isEmpty else { return anchor }
+        if anchor.isEmpty { return trimmed }
+        if anchor.last == " " || anchor.last == "\n" { return anchor + trimmed }
+        return anchor + " " + trimmed
+    }
+}