v1.2.0 — Niimbot B1 support + faster, self-identifying driver

Adds the Niimbot B1 (203 dpi, protocol 3) to the driver alongside the B1 Pro, and makes multi-label printing fast, continuous, and safe. Validated on real B1 hardware.

Added

• Niimbot B1 (b1 task, 203 dpi) — full print path: post-connect handshake, PrintStart 7b, PageStart, SetPageSize 6b, total-mode rows, status poll, PrintEnd.
• Model auto-identification — the B1 and B1 Pro share the BLE name, so the driver reads the model id (0x40[08], B1=4096 / B1 Pro=4097) and protocol version on connect, exposes Niimbot.printer, and refuses to print on a task/dpi mismatch. Niimbot.identify(model) returns it without printing.
• copies — printImage(url, { copies:N }) uploads the image once and the printer repeats it (as niim.blue does), far faster than re-sending.
• Frame bundling — several row frames per BLE write (Niimbot.BUNDLE_MAX, default 240) so even worst-case dense pages stream without stalling between labels.
• Niimbot.disconnect() — drop the link to pair another printer; demo gained Identify/Disconnect buttons and a 3-copies button.

Changed / Fixed

• B1 prints a batch as one continuous job of N pages (no retract between labels), matching the B1 Pro path.
• Print-position calibration (offset_y_px); row pacing aligned to niim.blue's 10 ms; flow control + handshake now follow the detected model.

Validated printers

Model	task	dpi
Niimbot B1 Pro	v4	300
Niimbot B1	b1	203

Other models in the same protocol families are likely compatible but untested. See docs/protocol-v4.md and README.md.

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