[fix](trx-frontend-http): speed up decode history replay

Serve decode history as gzipped CBOR and decode it in the frontend.
Defer map materialization until replay completes to avoid replay-time stutter,
and include the pending longest-QSO style adjustment.

Co-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Stan Grams <sjg@haxx.space>

Cargo.lock

@@ -2588,6 +2588,7 @@ dependencies = [
  "actix-ws",
  "bytes",
  "dirs",
+ "flate2",
  "futures-util",
  "hex",
  "pickledb",