NetGraph - v1.3.0

First public release. NetGraph had been developed privately up to this point;
this is the initial open-sourcing of the code at version 1.3.0. Everything below
describes the app as it stands at that release.

Added

• Network mapping — place modems, gateways, switches, access points,
  servers, VMs, and client devices on a pannable, zoomable canvas, each with a
  name, type, IP, MAC, domain, tags, and notes.
• Self-routing connections — orthogonal right-angle paths with rounded
  corners that route around other device cards, fall back to U-shapes for
  awkward angles, and snap straight when cards line up. Wired or wireless, with
  optional labels and a port at each end (a jack number or a named port like
  WAN, LAN, or PoE). Multiple links to one device fan out so they don't overlap.
• Connect mode — fast wiring with three sub-modes: Hub (fan out from one
  device), Single (one link at a time), and Advanced (the editor opens
  after each link). A live preview line follows the cursor and turns amber to
  block duplicate connections.
• Select mode — lasso a group of devices (live selection as the box sweeps),
  drag the whole group together, and copy, paste, duplicate, or delete the
  selection.
• VMs & containers — mark a device as hosted on a parent so the nesting is
  explicit on the map.
• Custom icons — use the built-in Lucide set or upload your own SVG, PNG, or
  JPG; icons are shared across every map. Uploaded SVGs pass through an
  allow-list sanitizer.
• Multiple maps — keep separate maps (blank or seeded from a worked example)
  and switch between them, rename, or delete.
• Import / export — save and load maps as plain JSON for backup and sharing,
  with full validation of every imported record.
• Offline copy — Download Offline Copy bakes the entire app into a single
  self-contained HTML file that runs from disk or a USB stick, online or
  air-gapped.
• Local-first storage — everything lives in the browser's localStorage;
  no backend, no accounts, no telemetry. Data never leaves the machine.
• Touch support — drag to pan, pinch to zoom, and long-press for context
  menus on tablets.