zeta: Onboarding and title bar banner (#23797)

Release Notes:

- N/A

---------

Co-authored-by: Danilo Leal <daniloleal09@gmail.com>
Co-authored-by: Danilo <danilo@zed.dev>
Co-authored-by: João Marcos <joao@zed.dev>

assets/icons/zed_predict.svg

@@ -1,5 +1,5 @@
 <svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
-<path d="M7 8.9V11C5.34478 11 4.65522 11 3 11V10.4L7 5.6V5H3V7.1" stroke="black" stroke-width="1.5"/>
 <path d="M12 5L14 8L12 11" stroke="black" stroke-width="1.5"/>
 <path d="M10 6.5L11 8L10 9.5" stroke="black" stroke-width="1.5"/>
+<path d="M7.5 8.9V11C5.43097 11 4.56903 11 2.5 11V10.4L7.5 5.6V5H2.5V7.1" stroke="black" stroke-width="1.5"/>
 </svg>

assets/icons/zed_predict_bg.svg

@@ -0,0 +1,19 @@
+<svg width="420" height="128" xmlns="http://www.w3.org/2000/svg">
+  <defs>
+    <pattern id="tilePattern" width="22" height="22" patternUnits="userSpaceOnUse">
+      <svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+        <path d="M12 5L14 8L12 11" stroke="black" stroke-width="1.5"/>
+        <path d="M10 6.5L11 8L10 9.5" stroke="black" stroke-width="1.5"/>
+        <path d="M7.5 8.9V11C5.43097 11 4.56903 11 2.5 11V10.4L7.5 5.6V5H2.5V7.1" stroke="black" stroke-width="1.5"/>
+      </svg>
+    </pattern>
+    <linearGradient id="fade" y2="1" x2="0">
+      <stop offset="0" stop-color="white" stop-opacity=".24"/>
+      <stop offset="1" stop-color="white" stop-opacity="0"/>
+    </linearGradient>
+    <mask id="fadeMask" maskContentUnits="objectBoundingBox">
+      <rect width="1" height="1" fill="url(#fade)"/>
+    </mask>
+  </defs>
+  <rect width="100%" height="100%" fill="url(#tilePattern)" mask="url(#fadeMask)"/>
+</svg>

assets/keymaps/default-linux.json

@@ -823,5 +823,12 @@
       "shift-end": "terminal::ScrollToBottom",
       "ctrl-shift-space": "terminal::ToggleViMode"
     }
+  },
+  {
+    "context": "ZedPredictModal",
+    "use_key_equivalents": true,
+    "bindings": {
+      "escape": "menu::Cancel"
+    }
   }
 ]

assets/keymaps/default-macos.json

@@ -883,7 +883,7 @@
     }
   },
   {
-    "context": "ZedPredictTos",
+    "context": "ZedPredictModal",
     "use_key_equivalents": true,
     "bindings": {
       "escape": "menu::Cancel"