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>

tv/autostart.sh

@@ -0,0 +1,34 @@
+#!/bin/sh
+# Luma's optional cold-boot hook. Installed only when explicitly requested.
+APP_DIR=/media/developer/apps/usr/palm/applications/com.ecklf.luma
+HOOK=/var/lib/webosbrew/init.d/65-luma
+case "${1:-}" in
+  enable)
+    [ "$(id -u)" = 0 ] || { printf '%s\n' 'Run as root.' >&2; exit 1; }
+    [ -f "$APP_DIR/appinfo.json" ] || { printf '%s\n' 'Install Luma first.' >&2; exit 1; }
+    mkdir -p /var/lib/webosbrew/init.d
+    if [ -e "$HOOK" ] || [ -L "$HOOK" ]; then
+      [ "$(readlink "$HOOK")" = "$APP_DIR/autostart.sh" ] || { printf '%s\n' '65-luma is already used by another file.' >&2; exit 1; }
+    fi
+    chmod 755 "$APP_DIR/autostart.sh"
+    ln -sf "$APP_DIR/autostart.sh" "$HOOK"
+    printf '%s\n' 'Luma will open after a full boot.'
+    exit 0 ;;
+  disable)
+    [ "$(id -u)" = 0 ] || exit 1
+    if [ "$(readlink "$HOOK")" = "$APP_DIR/autostart.sh" ]; then rm -f "$HOOK"; fi
+    printf '%s\n' 'Luma boot launch disabled.'
+    exit 0 ;;
+esac
+# A lock lives for this boot only; do not launch twice when the hook is invoked again.
+(
+    exec 9>/tmp/luma-boot.lock
+    flock -n 9 || exit 0
+    [ -f /tmp/luma-boot-done ] && exit 0
+    [ -f "$APP_DIR/appinfo.json" ] || exit 0
+    sleep 25
+    # -n prints the reply. -t is timing mode, not a firmware-specific flag.
+    RESULT="$(/usr/bin/luna-send -n 1 -w 5000 luna://com.webos.service.applicationmanager/launch '{"id":"com.ecklf.luma"}' 2>/dev/null)"
+    printf '%s\n' "$RESULT"
+    case "$RESULT" in *'"returnValue":true'*|*'"returnValue": true'*) touch /tmp/luma-boot-done ;; esac
+) </dev/null >/tmp/luma-boot.log 2>&1 &