Add git-based versioning and build version display

- versionCode from commit count + offset (always incremental)
- versionName from git tag (semantic versioning)
- BuildConfig.DISPLAY_VERSION shows "0.1.0+N.hash" in login screen
- Updated deploy.ps1 to use git versioning instead of manual bumps

app/build.gradle.kts

@@ -9,21 +9,25 @@ plugins {
 }
 
 // ── Git-based versioning ────────────────────────────────────
+// Version name from latest git tag (e.g. v0.1.0 -> "0.1.0")
 fun gitVersionName(): String = runGit("describe", "--tags", "--abbrev=0")
     .removePrefix("v")
     .ifEmpty { "0.1.0" }
 
-fun gitCommitCount(): Int = runGit("rev-list", "--count", "HEAD")
-    .toIntOrNull() ?: 1
+// Build number = total commits (always increments) + offset for store history
+const val VERSION_CODE_OFFSET = 4
+fun gitBuildNumber(): Int = (runGit("rev-list", "--count", "HEAD")
+    .toIntOrNull() ?: 1) + VERSION_CODE_OFFSET
 
 fun gitShortHash(): String = runGit("rev-parse", "--short", "HEAD")
     .ifEmpty { "unknown" }
 
+// Display: "0.1.0+5.abc1234"
 fun gitDisplayVersion(): String {
     val base = gitVersionName()
-    val count = gitCommitCount()
+    val build = gitBuildNumber()
     val hash = gitShortHash()
-    return "$base+$count.$hash"
+    return "$base+$build.$hash"
 }
 
 fun runGit(vararg args: String): String = try {
@@ -59,7 +63,7 @@ android {
         applicationId = "com.omixlab.lckcontrol"
         minSdk = 32
         targetSdk = 34
-        versionCode = gitCommitCount()
+        versionCode = gitBuildNumber()
         versionName = gitVersionName()
 
         buildConfigField("String", "DISPLAY_VERSION", "\"${gitDisplayVersion()}\"")