feat: show app version in Settings, fix composer NPE crash, bump to v0.2.0

- Settings: shows "Swoosh v0.2.0" at bottom
- Fix: NPE crash in composer error display (AnimatedVisibility exit)
- Version bumped to 0.2.0 (versionCode 2)
- CLAUDE.md: added versioning process documentation

CLAUDE.md

@@ -41,3 +41,20 @@ MVVM with Repository pattern, single-module Gradle project.
 - **Credentials:** Stored in `EncryptedSharedPreferences` (AES256-GCM) via `CredentialsManager`
 - **API client:** Base URL is configured at runtime during setup; `ApiClient` rebuilds Retrofit instance when URL changes
 - **Min SDK 26, Target/Compile SDK 34, Kotlin 1.9.22, Java 17**
+
+## Versioning
+
+Version is defined in `app/build.gradle.kts` (`versionCode` and `versionName`).
+
+- **Format:** Semantic versioning `MAJOR.MINOR.PATCH` (e.g., `0.2.0`)
+- **`versionCode`:** Integer, increment by 1 on every release (used by Google Play)
+- **`versionName`:** Human-readable, shown in Settings screen
+
+**When to bump:**
+- **PATCH** (0.2.0 → 0.2.1): Bug fixes, small tweaks, no new features
+- **MINOR** (0.2.0 → 0.3.0): New features, UI changes, significant improvements
+- **MAJOR** (0.x → 1.0): First stable public release
+
+**Current:** `versionName = "0.2.0"`, `versionCode = 2`
+
+**Process:** When making a release commit, bump both `versionCode` (+1) and `versionName` in `app/build.gradle.kts`. Always bump version when creating a release build or PR.

app/build.gradle.kts

@@ -12,8 +12,8 @@ android {
         applicationId = "com.swoosh.microblog"
         minSdk = 26
         targetSdk = 34
-        versionCode = 1
-        versionName = "1.0"
+        versionCode = 2
+        versionName = "0.2.0"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables { useSupportLibrary = true }

app/src/main/java/com/swoosh/microblog/ui/composer/ComposerScreen.kt

@@ -521,7 +521,7 @@ fun ComposerScreen(
                         Column {
                             Spacer(modifier = Modifier.height(12.dp))
                             Text(
-                                text = state.error!!,
+                                text = state.error ?: "",
                                 color = MaterialTheme.colorScheme.error,
                                 style = MaterialTheme.typography.bodySmall
                             )

app/src/main/java/com/swoosh/microblog/ui/settings/SettingsScreen.kt

@@ -141,6 +141,19 @@ fun SettingsScreen(
 
             Spacer(modifier = Modifier.height(8.dp))
 
+            // App version
+            Spacer(modifier = Modifier.height(16.dp))
+            val packageInfo = context.packageManager.getPackageInfo(context.packageName, 0)
+            Text(
+                text = "Swoosh v${packageInfo.versionName}",
+                style = MaterialTheme.typography.bodySmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                modifier = Modifier.fillMaxWidth(),
+                textAlign = androidx.compose.ui.text.style.TextAlign.Center
+            )
+
+            Spacer(modifier = Modifier.height(16.dp))
+
             // Disconnect all
             if (accountManager.getAccounts().size > 1) {
                 TextButton(