feat(oxibadge): add month-confirmation flow and fetch records/employees

Adds the screen after onboarding: pick a month/year (ConfirmMonth), show
loading screens while the device is queried, then download that month's
records and resolve each distinct employee's name, printing both to
stdout (debug pretty-print) before landing on the placeholder "done"
screen.

- r701: RecordIterator's boxed stream is now Send, required for it to
  cross into a Tauri command's future.
- oxibadge: load_records/load_employees commands, sharing the existing
  3-retry connect_with_retries helper. load_records uses skip_while/
  take_while on the device's newest-first stream to grab only the
  target month without walking its whole history, then a single
  collect + in-place Vec::reverse() back to chronological order.
- Shared LoadingScreen/Intro components extracted so future screens
  reuse the same look without duplicating markup/CSS.

Assisted-by: Claude Sonnet 5 <noreply@anthropic.com>

Cargo.lock

@@ -2113,10 +2113,12 @@ checksum = "04744f49eae99ab78e0d5c0b603ab218f515ea8cfe5a456d7629ad883a3b6e7d"
 name = "oxibadge"
 version = "0.1.0"
 dependencies = [
+ "chrono",
  "r701",
  "serde",
  "tauri",
  "tauri-build",
+ "tokio-stream",
  "toml 0.9.12+spec-1.1.0",
 ]