Press-and-hold peeks a segment — the tooltip, for hands without a mouse

The same 450ms hold that peeks a square now works on walls, doors, and
fire walls: the segment's full description (state, lock, hitpoints, the
fire's burn warning) rises in the peek scrim. Shimmering illusions keep
their richer tap modal.

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

packages/web/src/App.svelte

@@ -938,6 +938,9 @@
     clearSelection();
   }
 
+  // Press-and-hold on a wall/door/fire segment (touch has no hover).
+  let peekEdge = $state<string | null>(null);
+
   // A shimmering illusion wall, tapped or bumped: offer the belief test.
   let illusionPrompt = $state<{ cell: { x: number; y: number }; side: Side } | null>(null);
   function illusionEdgeParts(key: string): { cell: { x: number; y: number }; side: Side } {
@@ -1130,11 +1133,13 @@
     </div>
   {/if}
 
-  {#if peekCard || discardPeek || peekTreasure}
+  {#if peekCard || discardPeek || peekTreasure || peekEdge}
     <div class="big-peek-scrim" role="button" tabindex="-1"
-      onclick={() => { peekCard = null; peekCreatureId = null; peekToken = null; discardPeek = null; peekTreasure = null; }} onkeydown={() => {}}>
+      onclick={() => { peekCard = null; peekCreatureId = null; peekToken = null; discardPeek = null; peekTreasure = null; peekEdge = null; }} onkeydown={() => {}}>
       <div class="big-peek">
-        {#if peekTreasure}
+        {#if peekEdge}
+          <div class="peek-note big-peek-note">{peekEdge}</div>
+        {:else if peekTreasure}
           <img class="big-peek-token" src={peekTreasure.src} alt="" />
           <div class="peek-note big-peek-note">{peekTreasure.note}</div>
         {:else}
@@ -1559,6 +1564,7 @@
           onGhostClick={clickGhostSlot}
           onCellPeek={(c) => peekAt(c)}
           onIllusionClick={(cell, side) => (illusionPrompt = { cell, side })}
+          onEdgePeek={(tip) => (peekEdge = tip)}
           {litCells}
           {sightTrace}
         />