Switch to VectorEngine gpt-image-2 and edits

Replace uses of the legacy `gpt-image-2-all` model with `gpt-image-2` and standardize image workflows: no-reference generation uses POST /v1/images/generations, any-reference flows use POST /v1/images/edits with multipart `image` parts. Update SKILLs, generation scripts, decision logs, and docs to reflect the contract change and edits-vs-generations guidance. Apply corresponding changes across backend (api-server match3d/puzzle modules, openai image adapter, mappers, telemetry, spacetime client/module), frontend components and services (Match3D, Puzzle, CreativeImageInputPanel, runtime shells), and add new spritesheet/parser files and tests. Also add media/logo.png. These changes align repository code and documentation with the VectorEngine image API contract and update generation/upload handling (green-screen -> alpha processing, spritesheet handling, and related tests).

src/components/rpg-entry/RpgEntryHomeView.tsx

@@ -1166,13 +1166,21 @@ function PlatformTabButton({
       className={`platform-bottom-nav__button ${emphasized ? 'platform-bottom-nav__button--primary' : ''} ${active ? 'platform-bottom-nav__button--active' : ''}`}
     >
       <span className="platform-bottom-nav__button-content">
-        <span className="platform-bottom-nav__icon-shell">
+        <span
+          className={`platform-bottom-nav__icon-shell ${emphasized ? 'platform-bottom-nav__primary-action' : ''}`}
+        >
           <Icon className="platform-bottom-nav__icon" />
           {showDot ? (
             <span aria-hidden="true" className="platform-nav-unread-dot" />
           ) : null}
         </span>
         <span className="platform-bottom-nav__label">{label}</span>
+        {active ? (
+          <span
+            aria-hidden="true"
+            className="platform-bottom-nav__active-mark"
+          />
+        ) : null}
       </span>
     </button>
   );