[no bump] Ghost Mode: AyuGram's ghost mode with per-account and per-chat settings

Read receipts, story views, typing and online status are held back per
the options; read on interact, scheduled and silent sending as in AyuGram.
Every option resolves chat -> account -> global; forum topics follow
their group. Settings live in the plugin page, a chat/profile menu popup,
and a drawer row for the current account.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/hooking.py

@@ -0,0 +1,56 @@
+"""Small helpers around the SDK's Xposed hooking and Java threading."""
+
+from hook_utils import find_class
+
+
+def hook_all(plugin, class_name, method_name, hook):
+    """Hooks every overload of `class_name.method_name`; returns the unhook handles."""
+    clazz = find_class(class_name)
+    if clazz is None:
+        plugin.log(f"class not found: {class_name}")
+        return []
+    try:
+        unhooks = plugin.hook_all_methods(clazz, method_name, hook)
+    except Exception as exc:
+        plugin.log(f"failed to hook {class_name}.{method_name}: {exc}")
+        return []
+    unhooks = list(unhooks or [])
+    if not unhooks:
+        plugin.log(f"no overloads hooked for {class_name}.{method_name}")
+    return unhooks
+
+
+def unhook_all(plugin, handles):
+    for handle in handles:
+        try:
+            plugin.unhook_method(handle)
+        except Exception:
+            pass
+    del handles[:]
+
+
+def field(obj, name, default=None):
+    """A (possibly private) field of a Java object."""
+    value = getattr(obj, name, None)
+    if value is not None:
+        return value
+    try:
+        from hook_utils import get_private_field
+
+        value = get_private_field(obj, name)
+    except Exception:
+        value = None
+    return default if value is None else value
+
+
+def on_ui(plugin, fn, delay_ms=0):
+    """Runs `fn` on the UI thread; exceptions are logged, not lost."""
+    from android_utils import run_on_ui_thread
+
+    def run():
+        try:
+            fn()
+        except Exception as exc:
+            plugin.log(f"ui task failed: {exc}")
+
+    run_on_ui_thread(run, delay_ms)