fix v1.44.5: room climate counts hidden sensors; drop the stale room tooltip

- areaClimate() walks the HA registry for the area instead of the list
  of VISIBLE icons: a thermometer hidden by curation or by the user was
  silently dropped from the room card, tooltip and temperature fill
  (field report). Curation still filters fridges/TRVs; the auto icon is
  used on purpose so a custom marker icon cannot change what a device
  measures; an explicit per-room source still wins
- room tooltip no longer says 'open the area' — room clicks were removed
  in v1.40.1 (the link icon does it)
- +1 unit test (120); both changelogs updated

src/i18n/en.json

@@ -59,7 +59,6 @@
   "markup.delete": "Delete",
   "markup.hint_points": "points: {n} · Esc/Ctrl+Z — undo a dot · close the outline by clicking the first one",
   "markup.hint_start": "click a grid dot to start the outline",
-  "tip.room": "room — open the area",
   "tip.lqi": "average zigbee signal:",
   "info.device_header": "Device on the plan",
   "info.model": "Model",