v0.3.18

fix(bridge): probe sweeps bauds + lists ports; Setări dialog shows Save

Two user-visible issues:

1. The v0.3.17 probe at a single baud (configured) showed NAK on both
   fp55 and fp700 against the user's DP-25 — ruling out dialect but
   leaving them without a next step. Now probe_all() sweeps the common
   bauds (9600, 115200, 19200, 38400, 57600, 4800 × fp55+fp700) and
   stops at the first ACK. Also lists every COM port visible to the OS
   with description + manufacturer so the user can confirm COM4 really
   is the Datecs and not some other USB gadget. Report formatting
   rewritten: table per baud + explicit "Setează în Setări: baud=X,
   dialect=Y" recommendation when a working combo is found.

2. In the Setări imprimantă dialog the Save button had drifted off the
   bottom edge — v0.3.17 added two rows (Protocol dialect dropdown +
   hint) but the dialog was still 460×360. Bumped to 480×540 and made
   vertically resizable.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>