Fix live wiresheet config/runtime slot alignment and cap float display to 2 decimals

Slots with no flags (sensor, controlSignal, out_*) were not skipped
during config property reads, consuming bytes that the device never
sent and misaligning every subsequent config value (setpoint,
proportionalBand, etc.) into tiny denormalized floats like 2.36875e-41.

Changed the filter in _apply_props from "skip if runtime" to "skip if
not config" so only explicitly config-flagged slots are read from config
messages. Also switched iter("slot") to findall("slot") in the slot
registry builder to avoid picking up nested descendants.

Float display now defaults to 2 decimal places everywhere (wiresheet
and properties panel), honouring the precision facet when one exists.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app_state.py

@@ -8,7 +8,7 @@ so later rebinding would only ever be seen by the module that did it.
 import configparser
 import os
 
-VERSION = "0.0.0.089"
+VERSION = "0.0.0.092"
 PROPERTIES_FILE = os.path.join(os.path.dirname(os.path.abspath(__file__)), "editor.properties")
 DEFAULT_GRID_SIZE = 10
 DEFAULT_ADD_TIMESTAMP = True