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/config.py

@@ -0,0 +1,36 @@
+"""Setting keys and defaults."""
+
+SERVER_URL = "server_url"
+API_TOKEN = "api_token"
+KEEP_DELETED = "keep_deleted"
+RESTORE_MISSING = "restore_missing"
+REPORT_DELETIONS = "report_deletions"
+DELETED_ALPHA = "deleted_alpha"
+CACHE_DAYS = "cache_days"
+
+DEFAULTS = {
+    SERVER_URL: "",
+    API_TOKEN: "",
+    KEEP_DELETED: True,
+    RESTORE_MISSING: True,
+    REPORT_DELETIONS: True,
+    DELETED_ALPHA: 0,  # index into ALPHA_CHOICES
+    CACHE_DAYS: 2,  # index into CACHE_DAYS_CHOICES
+}
+
+# Opacity of deleted messages: well visible, marked by the trash icon.
+ALPHA_CHOICES = [("75%", 0.75), ("90%", 0.9), ("50%", 0.5)]
+
+# A chat's checked range of message ids stays valid this long: within it the
+# server is asked again only after an edit/delete event in the chat.
+COVERAGE_SECONDS = 3600
+# Cached server answers older than this are removed (checked once a day).
+CACHE_DAYS_CHOICES = [
+    ("1 day", 1),
+    ("7 days", 7),
+    ("30 days", 30),
+    ("90 days", 90),
+    ("365 days", 365),
+    ("Never", None),
+]
+HTTP_TIMEOUT_SECONDS = 15