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>

github_docs/de-Benutzeroberflaeche.md

@@ -186,6 +186,7 @@ Die Filterleiste befindet sich oberhalb der Chatmember-Tabelle. Filter können m
 |---|---|
 | **Show only QTF** | Zeigt nur Stationen innerhalb der gewählten Antennenrichtung und des konfigurierten Öffnungswinkels |
 | **Show only QRB [km] <=** | Begrenzt die Liste auf die eingetragene maximale Entfernung |
+| **Show only QRB [km] >** | Blendet Stationen bis zur eingetragenen Mindestentfernung aus; zusammen mit dem Höchstwert ergibt sich ein Entfernungsbereich |
 | **Find** | Filtert nach einem vollständigen oder teilweisen Rufzeichen |
 | **wkd** | Blendet Basisrufzeichen aus, die bereits auf mindestens einem unterstützten Band gearbeitet wurden |
 | einzelne Band-Schaltflächen | Blenden Stationen aus, die auf dem betreffenden Band bereits gearbeitet oder dort als NOT QRV markiert wurden |

github_docs/de-Changelog.md

@@ -24,6 +24,8 @@ Mehrere Operateure an einem Rechner können jetzt eigene Rufzeichen, Locators un
 
 - **Profilwechsel im laufenden Betrieb:** **File → Switch operator profile...** trennt die Verbindung und baut die Oberfläche mit den Einstellungen des gewählten Profils neu auf, ohne Programmneustart.
 
+- **Filter für eine Mindestentfernung:** Neben **Show only QRB [km] <=** gibt es in der Filterleiste jetzt **Show only QRB [km] >** (deutsche Oberfläche: **Nur QRB [km] >**). Er blendet alle Stationen bis zur eingetragenen Entfernung aus. Sind beide eingeschaltet, zeigt die Liste einen Entfernungsbereich, etwa nur Stationen zwischen 300 und 800 km. Stationen ohne bekannte Entfernung werden ausgeblendet, solange einer der beiden Filter aktiv ist, und die Stationskarte folgt dem Filter. Wie beim Höchstwert gilt der Wert nur für die laufende Sitzung. Damit ist [Issue #21](https://github.com/praktimarc/kst4contest/issues/21) umgesetzt.
+
 - **Windows-Installer:** Neben dem portablen ZIP-Paket gibt es für Windows bei Stable-Releases jetzt einen MSI-Installer (`KST4Contest-v<Version>-windows-x64.msi`). Er installiert KST4Contest ohne Administratorrechte für das aktuelle Benutzerkonto, legt einen Startmenü-Eintrag und eine Desktop-Verknüpfung an und ersetzt bei einem Update die vorhandene Installation. Einstellungen und Datenbank bleiben unter `%USERPROFILE%\.praktiKST` und werden mit einer portablen Kopie geteilt. Damit ist die erste Stufe von [Issue #61](https://github.com/praktimarc/kst4contest/issues/61) umgesetzt.
 
 ### Geändert

github_docs/de-Funktionen.md

@@ -227,6 +227,8 @@ Sinnvoll: Während man CQ in eine bestimmte Richtung ruft, nur Stationen in dies
 
 Stationen jenseits einer maximalen Entfernung ausblenden. Schaltfläche **„Show only QRB [km] <="** ist ein Toggle-Button.
 
+**„Show only QRB [km] >"** wirkt umgekehrt: Er blendet alle Stationen bis zur eingetragenen Entfernung aus, sodass nur die weiter entfernten übrig bleiben. Eine Station genau in dieser Entfernung wird ebenfalls ausgeblendet. Sind beide eingeschaltet, zeigt die Liste einen Bereich: `Minimum < QRB <= Maximum`. Solange einer der beiden Filter aktiv ist, werden Stationen ohne bekannte Entfernung ausgeblendet. Beide Werte gelten nur für die laufende Sitzung.
+
 ---
 
 ## Filter für Worked-Status, neue Bänder und neue Großfelder

github_docs/en-Changelog.md

@@ -24,6 +24,8 @@ Several operators sharing one computer can now use their own callsigns, locators
 
 - **Switching profiles while running:** **File > Switch operator profile...** closes the connection and rebuilds the user interface with the settings of the selected profile, without restarting the program.
 
+- **Minimum distance filter:** next to **Show only QRB [km] <=** the station filter bar has **Show only QRB [km] >**, which hides every station up to the entered distance. With both switched on, the list shows a distance range, for example only stations between 300 and 800 km. Stations without a known distance are hidden while either filter is on, and the station map follows the filter. Like the maximum, the value only lasts for the running session. This implements [Issue #21](https://github.com/praktimarc/kst4contest/issues/21).
+
 - **Windows installer:** next to the portable ZIP package, stable releases now also ship an MSI installer for Windows (`KST4Contest-v<version>-windows-x64.msi`). It installs KST4Contest for the current user account without administrator rights, adds a Start menu entry and a desktop shortcut, and replaces the existing installation on an update. Settings and database stay under `%USERPROFILE%\.praktiKST` and are shared with a portable copy. This implements the first stage of [Issue #61](https://github.com/praktimarc/kst4contest/issues/61).
 
 ### Changed

github_docs/en-Features.md

@@ -226,6 +226,8 @@ Useful: While calling CQ in a specific direction, only show stations in that dir
 
 Hide stations beyond a maximum distance. The **"Show only QRB [km] <="** button is a toggle.
 
+**"Show only QRB [km] >"** works the other way round: it hides every station up to the entered distance, so only the far ones remain. A station exactly at that distance is hidden as well. With both switched on, the list shows a range: `minimum < QRB <= maximum`. While either filter is on, stations without a known distance are hidden. Both values only last for the running session.
+
 ---
 
 ## Filters for Worked Status, New Bands and New Grid Squares

github_docs/en-User-Interface.md

@@ -188,6 +188,7 @@ The filter bar is located above the chat-member table. Filters can be combined;
 |---|---|
 | **Show only QTF** | Shows only stations inside the selected antenna direction and configured beamwidth |
 | **Show only QRB [km] <=** | Limits the list to the entered maximum distance |
+| **Show only QRB [km] >** | Hides stations up to the entered minimum distance; together with the maximum it shows a distance range |
 | **Find** | Filters by a complete or partial callsign |
 | **wkd** | Hides base callsigns already worked on at least one supported band |
 | individual band buttons | Hide stations already worked on that band or marked NOT QRV there |