Minimum QRB filter; the station map follows the station filters (#21) (#132)

* Add a minimum QRB filter to the station filter bar (#21)

Next to "Show only QRB [km] <=" the bar gets "Show only QRB [km] >": it
hides every station up to the entered distance. With both switched on the
list keeps a range, min < QRB <= max. The minimum is exclusive, as the
issue asks, so the two filters split the list without overlap at the same
value. A station without a known QRB is hidden while either is on, as the
maximum already did. The value lives in the bar for the running session
only, like the maximum, and the station map follows through activeFilters.

The distance check moves from the controller predicate into
StationFilterState.acceptsQrb so it can be tested; the maximum keeps its
behaviour (null or > max is hidden).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Document the minimum QRB filter (#21)

Changelog v1.50 under New, the filter tables of the user interface pages,
the distance filter section of the feature pages, and the station filter
page of the website.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Let the first filter bar row wrap instead of clipping (#21)

With both QRB filters the first row of the station filter bar no longer
fits a narrow station pane, and as a plain Row it cut the bearing buttons
off at the right edge. It is a FlowRow now. Reset, the QRB pair, the QTF
controls and the bearings each move to the next line as one group; the
QRB pair and the bearings only break up inside their group when even the
group is wider than the pane. Separators in the wrapping row have a fixed
height, because a flow row line has no intrinsic height to fill.

A screen test at 300 dp checks that every bearing button, both QRB labels
and fields and the QTF label are displayed and end inside the bar.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Refuse NaN, Infinity and negatives in the QRB filter fields (#21)

toDoubleOrNull also reads "NaN" and "Infinity": a pasted "Infinity" as
the minimum hid every station, "NaN" let every one through, and the
maximum field had the same hole before. Both QRB fields now go through
parseQrbKm, which takes only finite, non-negative distances; anything
else leaves the field at its last valid value.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Let the station map follow the station filters (#21)

The Compose map built its markers from all station rows, so no filter
reached it, although its status line reported "filtered view active".
The JavaFX map, up to beta-v1.50.0-beta-001, took the sorted, filtered
list (StationMapBridge.refreshNow), so this is a regression of the
Compose port that never shipped. The markers now come from the rows the
list shows, and the filter is a key of the remembered markers so a
filter change redraws them. A selected station that a filter hides gets
no marker, as in the JavaFX map.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Filter again on redraw; no path analysis for a hidden station (#21)

DataTableState.visibleRows caches the filtered rows, and forceRedraw only
bumped contentRevision. The filter reads fields that change in place
(QRB, worked and QRV flags, last activity), so a redraw could hand back
rows filtered before the change -- in the list and, since the map draws
the same rows, on the map. forceRedraw now drops the cache, and
visibleRows reads contentRevision so a reader recomputes after it. In the
running application the user-list refresh also sets a new row filter,
which dropped the cache before; this makes the redraw itself sufficient.

A selected station without a marker -- hidden by a filter, or without a
locator -- no longer starts a path analysis: the map used to set
"Loading" with an empty target and send the request. The analysis is
cleared instead, and the effect re-runs when the station's marker
appears or disappears.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

website/src/features/station-filters.md

@@ -36,6 +36,7 @@ KST4Contest therefore allows spatial, operating and propagation-related conditio
 
 - **Show only QTF** keeps stations inside the selected antenna direction and configured beamwidth.
 - **Show only QRB [km] <=** limits the list to the entered distance.
+- **Show only QRB [km] >** hides stations up to the entered distance; with both on, the list shows a distance range.
 
 ### Operating filters