Port sample-app to KMP with Android, iOS, Web, and SQLite (#16)

* chore(sample-app): hoist gradle wrapper to sample-app root

* chore(sample-app): add KMP root gradle config

* chore(sample-app): add composeApp KMP module build config

* chore(sample-app): add Android manifest for composeApp

* feat(sample-app): add shared domain models and auth constants

* feat(sample-app): add shared number and date formatting

* feat(sample-app): add cross-platform storage, clock, and id

* feat(sample-app): add shared repository with file-backed state

* feat(sample-app): add shared in-memory navigator

* feat(sample-app): add Compose theme and design tokens

* feat(sample-app): add shared UI components (icons, screen, widgets)

* feat(sample-app): add Login and Home pages

* feat(sample-app): add AddAccount, Ledger, AddTransaction pages

* feat(sample-app): add App root composable with routing

* feat(sample-app): add Android Application and Activity hosting Compose UI

* chore(sample-app): remove legacy android module (replaced by composeApp)

* chore(sample-app): bump to latest stable Kotlin/AGP/Compose deps

* fix(sample-app): make iOS compile (drop @Volatile, set bundleId)

* feat(sample-app): add xcodegen spec, SwiftUI host, and iOS Info.plist

* chore(sample-app): ignore build artifacts and generated xcodeproj

* chore(sample-app): update justfile for composeApp layout, add ios target

* docs(sample-app): rewrite README for KMP + iOS flow

* refactor(sample-app): drop in-app status bar and formatClock

* feat(sample-app): add SQLDelight schema and per-platform drivers

* refactor(sample-app): back Repository with SQLite, drop file serializer

* feat(sample-app): wire native back on Android and iOS edge swipe

* feat(sample-app): semantic roles, labels, and a11y descriptions

* fix(sample-app): link libsqlite3 for iOS target

SQLDelight's native driver needs libsqlite3.tbd on iOS; without it the
linker fails with undefined _sqlite3_bind_blob and friends.

* refactor(sample-app): abstract storage behind LedgerStore interface

Platform-specific createLedgerStore() returns a SqlLedgerStore backed
by SQLDelight on Android + iOS. Opens the door for a pure in-memory
web implementation that does not require a SQLite driver.

* feat(sample-app): add wasmJs target with in-memory LedgerStore

Wires a Compose Multiplatform browser canvas entry point. The web
implementation of LedgerStore is an in-memory model with localStorage
persistence, so it does not need a SQLite driver. Back navigation maps
the browser back button to the same BackHandler contract Android and
iOS use.

* chore(sample-app): settings + gitignore for wasmJs dev run

Registers the Node.js distributions repository and switches
repositoriesMode to PREFER_PROJECT so the Kotlin wasmJs plugin can
download its toolchain. Adds kotlin-js-store (lockfile) and ignores
runs/, web screenshots, playwright-mcp scratch output.

* fix(sample-app): singularize transaction count on Home

Shows "1 transaction" not "1 transactions" for accounts with a single
transaction; falls back to "$count transactions" otherwise.

examples/sample-app/gradlew.bat

@@ -0,0 +1,93 @@
+@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
+
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -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