feat(dxhunter): the chase gets a page of its own, and US states a switch

The chase switches were born on the DX Cluster page because the cluster
was the only thing that drew their badges. They now decide what the FT
decode list and Chase new say as well, and settings that govern three
screens should not live under the name of one of them. They move to a
DXHunter page — named for what it is about, and for what is meant to
land beside it as more of DXHunter's ideas are ported over.

US states join the switchable markers, gated the same way as POTA,
counties, prefixes and squares: badge, filter chip and display marker,
all from the one chaseAllows question.

frontend/src/App.tsx

@@ -102,7 +102,7 @@ import { ExportFieldsDialog } from '@/components/ExportFieldsDialog';
 import { ShutdownProgress } from '@/components/ShutdownProgress';
 import { ClusterGrid } from '@/components/ClusterGrid';
 import { cleanSpotter, inferSpotMode, spotModeCategory, spotStatusKey } from '@/lib/spot';
-import { applySpotDisplay, chaseCounty, chaseGrid, chasePfx, chasePota, readSpotDisplayOptions, spotIsWorked, SPOT_DISPLAY_OPTIONS_EXPOSED } from '@/lib/spotDisplay';
+import { applySpotDisplay, chaseCounty, chaseGrid, chasePfx, chasePota, chaseState, readSpotDisplayOptions, spotIsWorked, SPOT_DISPLAY_OPTIONS_EXPOSED } from '@/lib/spotDisplay';
 import { AnswerDecode, HaltDecodeTx, LogUIError, FlexTXOnBand, GetMatrixColors, GetRotorPresets, GetRowColors, GetSpotTTLMinutes, GetSpotMax, IsNewUSCounty } from '../wailsjs/go/main/App';
 import { applyMatrixColors } from '@/lib/matrixColors';
 import { WorkedBeforeGrid } from '@/components/WorkedBeforeGrid';
@@ -6265,7 +6265,8 @@ export default function App() {
             ]).filter((s: any) => (s.k !== 'new-pota' || chasePota())
               && (s.k !== 'new-county' || chaseCounty())
               && (s.k !== 'new-pfx' || chasePfx())
-              && (s.k !== 'new-grid' || chaseGrid()))
+              && (s.k !== 'new-grid' || chaseGrid())
+              && (s.k !== 'new-state' || chaseState()))
               .map((s: any) => fChip(s.k, s.label, s.cls, clusterStatusFilter.has(s.k),
               () => setClusterStatusFilter((cur) => { const n = new Set(cur); if (n.has(s.k)) n.delete(s.k); else n.add(s.k); return n; }), s.style))}
           </div>,