fix: integrate hint buttons into table for perfect row alignment and sticky scroll

Move hint buttons from a separate flex column into the table as the
first <td> of each row, ensuring pixel-perfect alignment with grid rows.
Use position:sticky with box-shadow to keep hints fixed on the left
while scrolling horizontally.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

assets/react/controllers/GameGrid.jsx

@@ -4,19 +4,6 @@ import ActorPopover from './ActorPopover';
 
 export default function GameGrid({ grid, width, middle }) {
     return (
-        <div className="game-grid-area">
-            <div className="hint-col">
-                {grid.map((row, rowIndex) => {
-                    if (row.separator !== undefined) {
-                        return <div key={rowIndex} className="hint-separator" />;
-                    }
-                    return (
-                        <div key={rowIndex} className="hint-cell">
-                            <ActorPopover hintType={row.hintType} hintText={row.hintText} />
-                        </div>
-                    );
-                })}
-            </div>
         <div className="game-grid-scroll">
             <table id="actors">
                 <tbody>
@@ -24,6 +11,7 @@ export default function GameGrid({ grid, width, middle }) {
                         if (row.separator !== undefined) {
                             return (
                                 <tr key={rowIndex} className="separator-row">
+                                    <td className="hint-cell" />
                                     {Array.from({ length: middle }, (_, i) => (
                                         <td key={i} />
                                     ))}
@@ -44,12 +32,13 @@ export default function GameGrid({ grid, width, middle }) {
                                 pos={row.pos}
                                 colStart={middle - row.pos}
                                 totalWidth={width}
+                                hintType={row.hintType}
+                                hintText={row.hintText}
                             />
                         );
                     })}
                 </tbody>
             </table>
         </div>
-        </div>
     );
 }

assets/react/controllers/GameRow.jsx

@@ -1,11 +1,12 @@
 import React, { useRef, useCallback, useMemo } from 'react';
 import LetterInput from './LetterInput';
+import ActorPopover from './ActorPopover';
 
 function isLetter(ch) {
     return /[a-zA-Z]/.test(ch);
 }
 
-export default function GameRow({ actorName, pos, colStart, totalWidth }) {
+export default function GameRow({ actorName, pos, colStart, totalWidth, hintType, hintText }) {
     const inputRefs = useRef([]);
     const letters = actorName.split('');
 
@@ -28,6 +29,9 @@ export default function GameRow({ actorName, pos, colStart, totalWidth }) {
 
     return (
         <tr>
+            <td className="hint-cell">
+                <ActorPopover hintType={hintType} hintText={hintText} />
+            </td>
             {Array.from({ length: totalWidth + 1 }, (_, colIndex) => {
                 const charIndex = colIndex - colStart;
                 const isInRange = charIndex >= 0 && charIndex < letters.length;

assets/styles/app.css

@@ -50,6 +50,7 @@ body {
 #actors td {
     width: var(--cell);
     height: var(--cell);
+    padding: 0;
     text-align: center;
     vertical-align: middle;
 }
@@ -534,33 +535,26 @@ body {
     margin: 0;
 }
 
-.game-grid-area {
-    display: flex;
-    align-items: flex-start;
-    margin-top: 16px;
-}
-
-.hint-col {
-    display: flex;
-    flex-direction: column;
-    padding-top: 5px;
-    gap: 5px;
-    flex-shrink: 0;
-    padding-right: 12px;
-}
-
 .hint-cell {
-    height: var(--cell);
+    padding: 0;
-    display: flex;
+    position: sticky;
-    align-items: center;
+    left: 5px;
-}
+    z-index: 1;
-
+    background: var(--surface);
-.hint-separator {
+    box-shadow:
-    height: 12px;
+        -5px 0 0 var(--surface),
+         5px 0 0 var(--surface),
+         0 -5px 0 var(--surface),
+         0  5px 0 var(--surface),
+        -5px -5px 0 var(--surface),
+         5px -5px 0 var(--surface),
+        -5px  5px 0 var(--surface),
+         5px  5px 0 var(--surface);
 }
 
 .game-grid-scroll {
     overflow-x: auto;
+    margin-top: 16px;
 }
 
 /* ── Game actions ── */