feat: responsive grid with scrollable area and fixed hint column

- Add CSS variables (--cell, --cell-font, --trigger-h) for responsive cell sizing
- Shrink grid cells at 600px and 420px breakpoints
- Add .page-body wrapper with 16px horizontal padding to prevent edge collisions
- Separate hint column from scrollable grid: hints rendered outside the table in a fixed flex column, only the letter grid scrolls horizontally

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

assets/react/controllers/GameGrid.jsx

@@ -1,41 +1,55 @@
 import React from 'react';
 import GameRow from './GameRow';
+import ActorPopover from './ActorPopover';
 
 export default function GameGrid({ grid, width, middle }) {
     return (
-        <table id="actors">
-            <tbody>
+        <div className="game-grid-area">
+            <div className="hint-col">
                 {grid.map((row, rowIndex) => {
                     if (row.separator !== undefined) {
-                        return (
-                            <tr key={rowIndex} className="separator-row">
-                                <td />
-                                {Array.from({ length: middle }, (_, i) => (
-                                    <td key={i} />
-                                ))}
-                                <td className="letter-static separator-char">
-                                    {row.separator === ' ' ? '' : row.separator}
-                                </td>
-                                {Array.from({ length: width - middle }, (_, i) => (
-                                    <td key={middle + 1 + i} />
-                                ))}
-                            </tr>
-                        );
+                        return <div key={rowIndex} className="hint-separator" />;
                     }
-
                     return (
-                        <GameRow
-                            key={rowIndex}
-                            actorName={row.actorName}
-                            pos={row.pos}
-                            colStart={middle - row.pos}
-                            totalWidth={width}
-                            hintType={row.hintType}
-                            hintText={row.hintText}
-                        />
+                        <div key={rowIndex} className="hint-cell">
+                            <ActorPopover hintType={row.hintType} hintText={row.hintText} />
+                        </div>
                     );
                 })}
-            </tbody>
-        </table>
+            </div>
+            <div className="game-grid-scroll">
+                <table id="actors">
+                    <tbody>
+                        {grid.map((row, rowIndex) => {
+                            if (row.separator !== undefined) {
+                                return (
+                                    <tr key={rowIndex} className="separator-row">
+                                        {Array.from({ length: middle }, (_, i) => (
+                                            <td key={i} />
+                                        ))}
+                                        <td className="letter-static separator-char">
+                                            {row.separator === ' ' ? '' : row.separator}
+                                        </td>
+                                        {Array.from({ length: width - middle }, (_, i) => (
+                                            <td key={middle + 1 + i} />
+                                        ))}
+                                    </tr>
+                                );
+                            }
+
+                            return (
+                                <GameRow
+                                    key={rowIndex}
+                                    actorName={row.actorName}
+                                    pos={row.pos}
+                                    colStart={middle - row.pos}
+                                    totalWidth={width}
+                                />
+                            );
+                        })}
+                    </tbody>
+                </table>
+            </div>
+        </div>
     );
 }

assets/react/controllers/GameRow.jsx

@@ -1,12 +1,11 @@
 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, hintType, hintText }) {
+export default function GameRow({ actorName, pos, colStart, totalWidth }) {
     const inputRefs = useRef([]);
     const letters = actorName.split('');
 
@@ -29,9 +28,6 @@ export default function GameRow({ actorName, pos, colStart, totalWidth, hintType
 
     return (
         <tr>
-            <td>
-                <ActorPopover hintType={hintType} hintText={hintText} />
-            </td>
             {Array.from({ length: totalWidth + 1 }, (_, colIndex) => {
                 const charIndex = colIndex - colStart;
                 const isInRange = charIndex >= 0 && charIndex < letters.length;