v0.7.0

Per-router collection settings, and the poll path made real

Stream-vs-poll and collector enablement used to live once in settings.json and apply to every
router. A hAP ax3 runs all 16 collectors happily; a hAP ac2 acting as an access point received the
same ~17 concurrent streams for data it does not have, and the only way to calm one router was to
slow every router. Both now live on each router.

Measured on the ac2, not assumed: cutting the stream count took traffic:update from 28 to 93
events per 120 s. The evidence points at concurrent open channels rather than data volume, which is
why every pollable collector now ships both paths.

Added

• Per-router collection settings, in the Add/Edit Router modal: a Stream/Poll master switch,
  enable/disable for 11 collectors, and interval overrides. Changing any of them rebuilds that one
  router's session; a label-only edit costs nothing.
• Poll paths for eight more collectors — arp, dhcpLeases, dhcpNetworks, firewall, netwatch,
  routing, vpn, wireless — so Poll genuinely means poll. Logs and the traffic graph stay streamed by
  design: polling /log/print drops entries between polls, and 1 s monitor-traffic polling is
  worse than one stream.
• A neutral "collection disabled" scrim on cards whose collector is switched off, so a disabled
  card no longer dims and reads as a fault.
• RouterOS API keepalive, which stops non-active routers reconnecting every ~17 s (#107).
• Persistent stream failure is now reported on the affected card instead of being restarted
  silently forever (#106).

Changed

• The global Collection Method setting is gone. A one-shot migration maps the old global choice
  onto each router first, so an install running global Poll does not revert to Stream on upgrade.
  Global Poll Intervals stay as the fleet-wide default that per-router values override.
• Settings always opens on the Routers tab rather than restoring the last tab used.
• The router Add/Edit modal is two columns and no longer scrolls on a normal desktop window.
• Streaming-first is reframed, not abandoned — streaming remains the default; per-router polling
  is a supported escape hatch for constrained hardware.

Fixed

• Interface rates never updated in poll mode. The poll filtered interfaces with
  !iface.disabled, but RouterOS sends disabled as the string "false" — truthy — so every
  interface was excluded and all rates sat at 0.00.
• Ping and Top Talkers died permanently in poll mode the first time every viewer disconnected:
  suspend() cleared the poll timer and resume() restarted only the stream.
• Connections went silent when switching routers. resume() runs before start() sets
  _started, so poll mode scheduled nothing. Stream mode hid this because its watchdog resurrects
  the stream; poll mode has no watchdog by design.
• Page-gated cards were blank for a full interval on every visit — 30 s for Wireless — because a
  poll loop armed its first timer an interval ahead instead of polling immediately.
• A router's update info stayed blank after switching to it, for up to updateCheckHours. The
  check's rate-limit slot is shared per router, so background sessions consumed the window and threw
  the answer away.
• Dashboard cards kept the previous router's rows after a switch. Nine cards were affected; Top
  Talkers was the visible one.
• False bell notifications on switch. The browser runs its own alert detectors, and they ignored
  each router's Alert Monitoring setting; ifstatus:update also carried no router id, so a late
  in-flight update from the outgoing router read as interfaces going down and back up.
• A wireless collector could latch onto a command tree the board does not have and never
  recover — a wifi-only board with its radios disabled answers empty, not with an error.
• A settings save no longer overwrites a per-router interval override.
• The Routers page no longer polls every non-active router at 1 s regardless of configuration.

Notes for upgraders

The five stream* keys are removed from settings.json. The migration runs once at startup and
writes an equivalent collection block onto any router that needs one, so no action is required.
Per-router settings live in /data/routers.json; a router with no collection block streams, which
is the previous default.