fix(game): no placement auto-zoom in landscape

Landscape fits the whole board, so the coarse-pointer auto-zoom on tile
placement, drag hover-hold and hint only hid the rest of the position.
Gate all three on portrait; manual double-tap/pinch zoom is unchanged.
New e2e lock both sides: landscape placement stays unzoomed, portrait
placement still auto-zooms (touch-emulated, both engines).

ui/src/game/Game.svelte

@@ -509,6 +509,7 @@
       draggingPend = src.from === 'board' ? { row: src.row, col: src.col } : null;
       // No zoom on drag start: the player may still change their mind. Holding the tile
       // over a cell for ~1s auto-zooms there (hover-hold below); a drop also zooms+centres.
+      // Both auto-zooms are portrait-only — landscape fits the whole board.
     }
     if (!drag) return;
     drag = { ...drag, x: e.clientX, y: e.clientY };
@@ -539,7 +540,7 @@
           ? setTimeout(() => {
               // Still holding the tile over this cell: magnify into it. Only the first
               // (zoom-in) hold centres; once zoomed we never move the board on hover.
-              if (drag && isCoarse() && !zoomed) {
+              if (drag && isCoarse() && !landscape && !zoomed) {
                 focus = c;
                 zoomed = true;
                 haptic('light');
@@ -652,7 +653,9 @@
     if (board[row]?.[col]) return;
     if (pendingMap.has(`${row},${col}`)) return;
     focus = { row, col };
-    if (isCoarse() && !zoomed) zoomed = true;
+    // Auto-zoom is portrait-only: landscape fits the whole board, magnifying it there
+    // only hides the rest of the position.
+    if (isCoarse() && !landscape && !zoomed) zoomed = true;
     if (placement.rack[index] === BLANK) {
       blankPrompt = { rackIndex: index, row, col };
       return;
@@ -844,12 +847,13 @@
             row: Math.round((Math.min(...rows) + Math.max(...rows)) / 2),
             col: Math.round((Math.min(...cols) + Math.max(...cols)) / 2),
           };
-          // Ask the board to scroll to the hint word. A zoom-out board zooms in (and centres) on
-          // the next line; this nonce also recentres a board that is already zoomed in, where the
-          // unchanged zoom state would otherwise leave it parked where the player was looking.
+          // Ask the board to scroll to the hint word. A zoomed-out board zooms in (and centres)
+          // on the next line (portrait only); this nonce also recentres a board that is already
+          // zoomed in, where the unchanged zoom state would otherwise leave it parked where the
+          // player was looking.
           recenter++;
         }
-        if (isCoarse()) zoomed = true;
+        if (isCoarse() && !landscape) zoomed = true;
         view = { ...view, hintsRemaining: h.hintsRemaining, walletBalance: h.walletBalance };
         syncWallet(h.walletBalance);
         // The hint is the engine's own top-ranked, fully scored legal move: reuse it as the