fix incorrect Hide-from-undetected edge in stealth flowchart

HIDE only rolls against creatures currently observing you; if already
hidden or undetected, you retain that condition. Remove the erroneous
UNDETECTED → HIDE → HIDDEN transition and update the rules note.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

index.html

@@ -397,7 +397,6 @@ flowchart LR
   (not invisible)"| OBS
 
   UND -->|"SNEAK ✓ Success"| UND
-  UND -->|"HIDE ✓ Success"| HID
   UND -->|"Speak or
   make loud noise"| OBS
 
@@ -410,7 +409,7 @@ flowchart LR
       <div class="note-box">
         <h3>Key Rules</h3>
         <ul>
-          <li><strong>HIDE</strong> requires that you have cover or concealment from the target. You can&rsquo;t hide in the open.</li>
+          <li><strong>HIDE</strong> only rolls against creatures that are currently <em>observing</em> you. If a creature already considers you hidden or undetected, you simply retain that condition — HIDE does not improve your state from undetected.</li>
           <li><strong>SNEAK</strong> requires cover or concealment at <em>both the start and end</em> of your movement. You move up to half your Speed.</li>
           <li>Taking any non-<em>unobtrusive</em> action while hidden immediately makes you <strong>Observed</strong>.</li>
           <li>A <strong>Strike</strong> from a hidden or undetected position makes you <strong>Observed</strong> after the attack (target now knows your location).</li>