Every edge answers a hover: tooltips for walls, doors, fire, illusions

Only the special door lock states carried titles. Now plain walls ('a
wall'), locked doors, the wall of fire (with its 4-damage warning), the
untested shimmer ('tap to test your eyes'), the known-illusion ghost,
and battle cracks (damage taken so far) all speak on hover. The
firewall's hover target is its bar; the flames stay click-through.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0138A8CjeQRpvzKxuMfz1Bqc

packages/web/src/FirewallEdge.svelte

@@ -25,7 +25,8 @@
   const py = (t: number) => (kind === "V" ? t * CELL : 0);
 </script>
 
-<g transform={`translate(${cx} ${cy})`} class="fw" aria-hidden="true">
+<g transform={`translate(${cx} ${cy})`} class="fw">
+  <title>a wall of fire — passing through burns for 4</title>
   <defs>
     <linearGradient id={`fw-bar-${uid}`} x1="0" y1="1" x2="0" y2="0">
       <stop offset="0" stop-color="#7c1a14" />
@@ -65,7 +66,7 @@
 </g>
 
 <style>
-  .fw { pointer-events: none; }
+  .fw-tongue, .fw-ember { pointer-events: none; }
   .fw-bar {
     stroke: #7c1a14;
     stroke-width: 1;