Android: app shell + Custom Settings engine + Home Assistant integration

Generic settings architecture (data-driven, no per-setting UI code):
- SettingDefinition (id/name/description/category/type/default/min/max/
  choices/editable/sensitive/requiresRestart/visibleIf) x 8 types:
  boolean/string/number/select/multi-select/color/url/secret
- SettingsManager: validation, reset, custom CRUD, export/import
  (all-or-nothing with per-key rejection reasons; custom definitions
  travel in the export), secrets routed to EncryptedSharedPreferences
  (AndroidKeyStore master key) and excluded from export by default
- Settings screen renders controls from the type; search; add/edit/delete
  dialogs for custom settings; import/export dialogs
- Built-ins: General / Home Assistant / Appearance / Network / Advanced

Home Assistant integration (official REST + WebSocket APIs only):
- HomeAssistantClient: GET /api/, /api/states, /api/states/{id},
  POST /api/services/{domain}/{service}, WS /api/websocket
  (auth -> subscribe_events state_changed) with exponential-backoff
  reconnect; safe HaError types that never contain the token
- HaRepository: single service layer between UI and client; optimistic
  toggles reconciled by WS; poll fallback from refresh-interval setting
- Devices screen: discovery list, search, live states, toggles
  (light/switch/fan/input_boolean/humidifier)
- Cleartext permitted for LAN http:// URLs (same stance as the official
  HA companion app; TLS verification untouched); consent dialog on first
  launch; Record button present but inert until M4 (honest label)
- Tests: 29 unit tests (19 settings incl. secret routing, import
  validation, persistence; 10 HA via MockWebServer incl. 401 handling,
  unreachable, WS handshake + event + auth_invalid). All green.

Docs: docs/home-assistant.md (install, token creation, storage,
troubleshooting, endpoint table); README + ROADMAP updated honestly
(live e2e against a real HA server still in progress).

android/gradlew.bat

@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega