Merge Luma launcher fork into monorepo

Move trampoline files (boot-hook, watcher, overlay) into trampoline/
subdirectory. Add upstream Luma v2.3.1 source at repo root with our
additions:

- Page::Ha (4th nav tab) with placeholder empty state
- HA tab config schema and default entity mapping (ha-home/)
- Nav keys renamed: "home" → "start", new "ha" tab between Apps and Settings
- All state.rs/view.rs/main.rs/tests.rs updated for 4-tab navigation

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

ha-home/config.schema.json

@@ -0,0 +1,105 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "Luma Home Tab Configuration",
+  "description": "Configuration for the Home Assistant tab in the Luma launcher on webOS TV",
+  "type": "object",
+  "required": ["version", "ha", "rooms"],
+  "properties": {
+    "version": {
+      "const": 1,
+      "description": "Schema version"
+    },
+    "ha": {
+      "type": "object",
+      "required": ["url", "token"],
+      "properties": {
+        "url": {
+          "type": "string",
+          "description": "Home Assistant WebSocket URL (wss://...)"
+        },
+        "token": {
+          "type": "string",
+          "description": "Long-lived access token"
+        }
+      }
+    },
+    "weather": {
+      "type": "object",
+      "properties": {
+        "entity_id": {
+          "type": "string",
+          "description": "Weather entity to display (e.g. weather.forecast_home)"
+        }
+      }
+    },
+    "vacuum": {
+      "type": "object",
+      "properties": {
+        "entity_id": {
+          "type": "string",
+          "description": "Vacuum entity ID"
+        },
+        "cleaning_mode_entity": {
+          "type": "string",
+          "description": "Select entity for cleaning mode (vacuum/mop/vac_and_mop)"
+        },
+        "rooms": {
+          "type": "object",
+          "description": "Map of segment ID to display name",
+          "additionalProperties": { "type": "string" }
+        }
+      }
+    },
+    "rooms": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "required": ["id", "name", "cards"],
+        "properties": {
+          "id": {
+            "type": "string",
+            "description": "HA area_id or custom slug"
+          },
+          "name": {
+            "type": "string",
+            "description": "Display name"
+          },
+          "background": {
+            "type": "string",
+            "description": "Background image filename (served from config dir)"
+          },
+          "sensors": {
+            "type": "array",
+            "description": "Sensor entity IDs shown as badges in room header",
+            "items": { "type": "string" }
+          },
+          "cards": {
+            "type": "array",
+            "items": {
+              "type": "object",
+              "required": ["type", "entity_id"],
+              "properties": {
+                "type": {
+                  "enum": ["toggle", "range", "climate", "action", "vacuum"],
+                  "description": "Card type"
+                },
+                "entity_id": {
+                  "type": "string",
+                  "description": "HA entity ID"
+                },
+                "name": {
+                  "type": "string",
+                  "description": "Override display name (defaults to HA friendly_name)"
+                },
+                "icon": {
+                  "type": "string",
+                  "description": "Override icon name"
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}