Queue UI fixes: disable would-409 controls, hover trace from landing airport, grounded queues draw dotted lines (ISS-077, v0.41.0)

components/LeftPane.tsx

@@ -207,6 +207,11 @@ export default function LeftPane({ state, loading, error, onRefresh, applySnapsh
   const relocatePlane = relocatable.find((p) => p.id === relocatePlaneId) ?? relocatable[0] ?? null;
   const relocateDest =
     airportOptions === null ? null : airportOptions.find((a) => a.icao === relocateDestIcao) ?? airportOptions[0] ?? null;
+  // ISS-077 (v0.41.0): while flying, the Relocate click would POST /queue — block it when the selected
+  // destination is already active or queued (the server rejects that with 409). Grounded planes are unaffected.
+  const relocateBlocked =
+    relocatePlane?.status === 'flying' && relocateDest !== null &&
+    (relocatePlane.destIcao === relocateDest.icao || relocatePlane.queue.includes(relocateDest.icao));
 
   // ISS-035 (v0.23.0): Refuel-to-full — any GROUNDED plane with fuel below max can be topped up via the
   // existing refuel endpoint (no body → server defaults to mode 'full'). Moved here from the right-pane
@@ -408,6 +413,10 @@ export default function LeftPane({ state, loading, error, onRefresh, applySnapsh
                       )}
                       {cargo.map((pkg) => {
                         const penalty = abandonPenalty(pkg, clockMs);
+                        // ISS-077 (v0.41.0): while flying the click would POST /queue — disable it when the
+                        // destination is already active or queued (the server rejects that with 409). Grounded
+                        // clicks go to /fly, which has no such conflict.
+                        const alreadyQueued = p.status === 'flying' && (p.destIcao === pkg.destIcao || p.queue.includes(pkg.destIcao));
                         return (
                           // ISS-025 (v0.22.0): hovering a loaded package draws its full origin→dest trace on the map —
                           // same as job-list rows — and keeps this plane's halo lit via planeId. Leaving the row restores
@@ -424,7 +433,8 @@ export default function LeftPane({ state, loading, error, onRefresh, applySnapsh
                               type="button"
                               data-testid={`fly-to-${pkg.id}`}
                               className="pane-btn onboard-fly-btn"
-                              disabled={actionsBusy}
+                              disabled={actionsBusy || alreadyQueued}
+                              title={alreadyQueued ? 'Already in flight queue' : undefined}
                               // ISS-053 (v0.32.0): a flying plane can't start another leg — the click queues it instead,
                               // so "Fly to …" works from any state and the queue needs no dedicated input.
                               onClick={() => void runAction(`/api/planes/${p.id}/${p.status === 'flying' ? 'queue' : 'fly'}`, { destIcao: pkg.destIcao })}
@@ -551,7 +561,9 @@ export default function LeftPane({ state, loading, error, onRefresh, applySnapsh
                 onChange={(e) => setRelocateDestIcao(e.target.value || null)}
               >
                 {airportOptions?.map((a) => (
-                  <option key={a.icao} value={a.icao}>
+                  // ISS-077 (v0.41.0): a flying plane's active/queued airports can't be re-selected — the
+                  // server would reject them with 409; native disabled options, no text change.
+                  <option key={a.icao} value={a.icao} disabled={relocatePlane?.status === 'flying' && (relocatePlane.destIcao === a.icao || relocatePlane.queue.includes(a.icao))}>
                     {a.name}
                   </option>
                 ))}
@@ -560,7 +572,7 @@ export default function LeftPane({ state, loading, error, onRefresh, applySnapsh
                 type="button"
                 data-testid="relocate-go"
                 className="pane-btn"
-                disabled={actionsBusy || relocatePlane === null || relocateDest === null}
+                disabled={actionsBusy || relocatePlane === null || relocateDest === null || relocateBlocked}
                 // ISS-053 (v0.32.0): a flying plane can't start another leg — queue it instead, so the
                 // relocation takes off when the current one lands.
                 onClick={() => {