feat: remember the install and open on the plan

An install writes retrobios-backup/<folder>.install.json beside the BIOS
folder: each file it placed with its sha1, size and source, and the choice
it made. The next run for the same setup and folder takes that choice when
the command line chose nothing, in line mode and on the full screen, and
says so. A record that cannot be read is said once and ignored. A record
event reports it.

With one setup found, the full screen opens on its plan, Change where one
row away. The plan's Install row says the size its headline says.

scripts/generate_event_schema.py

@@ -37,10 +37,11 @@ KEY_TYPES: dict[str, dict] = {
     **dict.fromkeys((
         "installer", "os", "os_name", "stage", "reason", "platform", "message",
         "folder", "dest", "system", "name", "bios_dir", "path", "member",
-        "list_version", "installed_version", "board", "core",
+        "list_version", "installed_version", "board", "core", "date",
     ), _TEXT),
     "mode": {"enum": ["install", "check", "dry-run", "list"]},
     "state": {"enum": ["present", "wrong_hash", "missing"]},
+    "status": {"enum": ["applied", "written", "unreadable", "not_written"]},
     **dict.fromkeys((
         "files", "files_done", "files_total", "bytes", "bytes_done", "bytes_total",
         "bytes_local", "bytes_network", "size", "present", "missing", "wrong_hash",
@@ -48,7 +49,7 @@ KEY_TYPES: dict[str, dict] = {
         "pending", "code", "games", "recognised", "not_games",
     ), _COUNT),
     **dict.fromkeys(("truncated", "ok", "interrupted", "required_only", "applied", "info"), _FLAG),
-    **dict.fromkeys(("systems", "other_drives", "dests", "written"), _NAMES),
+    **dict.fromkeys(("systems", "other_drives", "dests", "written", "choice"), _NAMES),
     **dict.fromkeys(("platforms", "failed", "skipped", "left_out", "kept", "found",
                      "fallback"), _RECORDS),
 }