Message Logger: show logged edits and deletions from telegram-panel [no bump]

Keeps deleted messages (75% opacity, red icon-pack trash icon), restores
logged messages deleted while away, reports deletions, and shows edit
history as a mock chat (Edit history in the message menu, Open topic).
Message links and history open as any signed-in account with access.
Per-master API tokens; chat state synced per checked range with an hour's
validity, cached in SQLite with a configurable lifetime.

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

src/diag.py

@@ -0,0 +1,54 @@
+"""Diagnostics mirrored to a file, since this device's logcat surfaces neither
+Chaquopy stdout nor android_utils.log output.
+
+The file lives under `get_files_dir()` (app external storage), so it is
+readable over adb:
+  adb shell cat "/sdcard/Android/data/com.exteragram.messenger/files/exteraGram/exteraGram Files/message_logger/diag.log"
+"""
+
+import os
+import time
+import traceback
+
+_MAX_BYTES = 256 * 1024
+_path = None
+
+
+def _file():
+    global _path
+    if _path is None:
+        try:
+            from file_utils import get_files_dir
+
+            directory = os.path.join(get_files_dir(), "message_logger")
+            os.makedirs(directory, exist_ok=True)
+            _path = os.path.join(directory, "diag.log")
+        except Exception:
+            _path = ""
+    return _path
+
+
+def log(message):
+    line = time.strftime("%H:%M:%S ") + str(message)
+    try:
+        from android_utils import log as android_log
+
+        android_log("[message_logger] " + line)
+    except Exception:
+        pass
+    path = _file()
+    if not path:
+        return
+    try:
+        mode = "a"
+        if os.path.exists(path) and os.path.getsize(path) > _MAX_BYTES:
+            mode = "w"
+        with open(path, mode, encoding="utf-8") as handle:
+            handle.write(line + "\n")
+    except Exception:
+        pass
+
+
+def error(where, exc=None):
+    detail = traceback.format_exc() if exc is not None else ""
+    log(f"ERROR {where}: {exc!r}\n{detail}")