PROC: activate approach/missed/vector-to-final; DCLTR-2 declutters airspace

PROC menu actions were empty stubs. Now: procedures.js tags approach legs with
seg ('approach'|'missed' — everything past the runway threshold = missed,
previously dropped); Proc.jsx flags loaded legs appr/missed (preserved by
flightplan.setPlan) and the ACTIVATE APPROACH / MISSED APPROACH / VECTOR-TO-FINAL
items set the active (magenta) leg to the matching segment, with a hint when
nothing is loaded. Missed legs shown dimmed in the preview.

DCLTR-2 now hides the airspace (SUA) overlay, matching the manual (p.56), in
addition to the existing nav-symbol declutter.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server/procedures.js

@@ -121,6 +121,10 @@ export function procedureLegs(icao, type, name, trans) {
 
   const out = [];
   const seen = new Set();
+  // For approaches, the runway threshold is the Missed-Approach Point: legs after
+  // it are the missed-approach segment. We tag (rather than drop) them so the
+  // FMS can hold them un-sequenced and "Activate Missed Approach" can fly them.
+  let inMissed = false;
   for (const leg of seq) {
     if (!leg.fix) continue;                          // heading/altitude legs w/o a fix
     if (seen.has(leg.fix)) continue;                 // de-dupe repeated fixes
@@ -133,9 +137,10 @@ export function procedureLegs(icao, type, name, trans) {
     }
     if (!pt) continue;                               // unresolved fix → skip
     seen.add(leg.fix);
-    out.push({ id: leg.fix, lat: pt.lat, lon: pt.lon, type: isRwy ? 'APT' : 'WPT', alt: leg.alt });
-    // An approach ends at the runway threshold — drop the missed-approach legs.
-    if (TYPE === 'APPCH' && isRwy) break;
+    const wp = { id: leg.fix, lat: pt.lat, lon: pt.lon, type: isRwy ? 'APT' : 'WPT', alt: leg.alt };
+    if (TYPE === 'APPCH') wp.seg = inMissed ? 'missed' : 'approach';
+    out.push(wp);
+    if (TYPE === 'APPCH' && isRwy) inMissed = true;  // everything past the runway = missed
   }
   return out;
 }