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/IllusionShimmer.svelte

@@ -18,7 +18,7 @@
   <line {x1} {y1} {x2} {y2} class="illusion-hit"
     role="button" tabindex="-1" aria-label="a shimmering wall — test your eyes"
     onclick={(ev) => { ev.stopPropagation(); onclick?.(); }}
-    onkeydown={() => {}} />
+    onkeydown={() => {}}><title>this wall shimmers oddly — tap to test your eyes</title></line>
 {/if}
 
 <style>