docs(tiles): comments say 6 tiles and name the zoom button

The grid holds at most TILE_GRID_MAX (6) tiles, but the file header of
tile-grid.js, the comment over its section in index.html and the grid
block in styles.css still said 1 to 9. The tile header descriptions in
_buildTileHeader, .tile-header and the chrome test listed `⋯ ×` without
the zoom button, and the glyph-size rule still spoke of four glyphs and
the plus that owner decision 9 removed. Comments only.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/web/public/index.html

@@ -436,7 +436,7 @@
           autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false"></textarea>
       </div>
 
-      <!-- Tile grid (tile-grid.js): 1 to 9 sessions side by side, each a
+      <!-- Tile grid (tile-grid.js): 1 to 6 sessions side by side, each a
            TerminalTile. A SIBLING of .terminal-wrap, never a parent: while
            .main.tiles-active is set the main terminal is parked (hidden) and
            this section takes its place. -->

src/web/public/styles.css

@@ -19369,10 +19369,10 @@ html[data-session-list="sidebar"][data-sidebar="collapsed"] .btn-sidebar-toggle
 }
 
 /* ── Tile grid (tile-grid.js, docs/tile-grid-plan.md) ──────────────────────
-   1 to 9 sessions side by side, each a TerminalTile. The section is a SIBLING of
-   .terminal-wrap; .main.tiles-active swaps one for the other (the main terminal
-   is parked while the grid is open). Columns and rows are set inline by
-   _applyTileLayout() from the tile count. */
+   1 to TILE_GRID_MAX (6) sessions side by side, each a TerminalTile. The
+   section is a SIBLING of .terminal-wrap; .main.tiles-active swaps one for the
+   other (the main terminal is parked while the grid is open). Columns and rows
+   are set inline by _applyTileLayout() from the tile count. */
 .tile-grid {
   display: none;
 }
@@ -19437,7 +19437,7 @@ html[data-session-list="sidebar"][data-sidebar="collapsed"] .btn-sidebar-toggle
   background: transparent !important;
 }
 
-/* Tile header: `● name ......... ⋯ ×`. FIXED height (#464): the body below
+/* Tile header: `● name ......... ⋯ ⤢ ×`. FIXED height (#464): the body below
    holds the xterm, so a header that grew (a wrapped name, the rename input)
    would shrink the body with nothing refitting the xterm or its PTY. */
 .tile-header {
@@ -19492,8 +19492,8 @@ html[data-session-list="sidebar"][data-sidebar="collapsed"] .btn-sidebar-toggle
   opacity: 0.7;
 }
 
-/* The ellipsis and the cross are thin glyphs: a step up so all four read at
-   the same visual size as the arrow and the plus. */
+/* The ellipsis and the cross are thin glyphs: a step up so they read at the
+   same visual size as the zoom arrow. */
 .tile-btn.tile-menu,
 .tile-btn.tile-remove {
   font-size: 19px;

src/web/public/tile-grid.js

@@ -1,9 +1,9 @@
 // src/web/public/tile-grid.js
 
 /**
- * @fileoverview The tile grid: 1 to 9 live sessions side by side in one
- * window, each in its own TerminalTile (terminal-tile.js), laid out by count
- * (window.CodemanTileGrid, constants.js). Desktop only; see
+ * @fileoverview The tile grid: 1 to TILE_GRID_MAX (6) live sessions side by
+ * side in one window, each in its own TerminalTile (terminal-tile.js), laid
+ * out by count (window.CodemanTileGrid, constants.js). Desktop only; see
  * docs/tile-grid-plan.md.
  *
  * While the grid is open the main terminal (terminal-ui.js) is PARKED: hidden,
@@ -1054,9 +1054,9 @@ Object.assign(CodemanApp.prototype, {
   },
 
   /**
-   * `● name ......... ⋯ ×`: the status dot (the six-state classifier the tab
+   * `● name ......... ⋯ ⤢ ×`: the status dot (the six-state classifier the tab
    * rows and both home screens share), the session name (double-click
-   * renames), the session menu (the tab rail's own) and remove-tile. Its
+   * renames), the session menu (the tab rail's own), zoom and remove-tile. Its
    * buttons stop pointerdown, so acting on a tile that is not focused does not
    * also focus it (and spend its idle alert).
    */