feat(kotlin-compose): design system + 33 components + gallery_kt + e2e android emulator + scaffolder fixes

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

bash/functions/infra/android_screenshot.md

@@ -0,0 +1,52 @@
+---
+name: android_screenshot
+kind: function
+lang: bash
+domain: infra
+version: "1.0.0"
+purity: impure
+signature: "android_screenshot([--serial <S>], output_path: string) -> void"
+description: "Capture screen as PNG via adb exec-out screencap -p."
+tags: [android, adb, screenshot, screen, capture]
+uses_functions: [adb_wsl_bash_infra]
+uses_types: []
+returns: []
+returns_optional: false
+error_type: "error_go_core"
+imports: []
+params:
+  - name: "--serial <S>"
+    desc: "Optional ADB serial to target a specific device/emulator. If omitted, autodetects the first connected device."
+  - name: "output_path"
+    desc: "WSL path where the PNG screenshot will be written (e.g. /tmp/screen.png). Parent directory is created if absent."
+output: "Stdout 'screenshot: <path> (<bytes> bytes) from <serial>'. PNG file written to disk."
+tested: false
+tests: []
+test_file_path: ""
+file_path: "bash/functions/infra/android_screenshot.sh"
+---
+
+## Ejemplo
+
+```bash
+source bash/functions/infra/android_screenshot.sh
+android_screenshot /tmp/screen.png
+# screenshot: /tmp/screen.png (123456 bytes) from emulator-5554
+
+# Targeting a specific device:
+android_screenshot --serial emulator-5554 /tmp/screen.png
+```
+
+## Notas
+
+Sources `adb_wsl.sh` from its own directory, so `ADB` and `ANDROID_SDK_WIN` env vars
+are respected as with all other android_* functions.
+
+Exit codes:
+- `0` — screenshot captured successfully.
+- `1` — missing output path, screencap produced empty file, or adb error.
+- `3` — no device/emulator connected (propagated from `adb_pick_serial`).
+
+The emptiness check (`! -s`) handles the case where `adb exec-out` exits 0 but writes
+zero bytes (e.g. device locked, screencap permission denied). In that case the file is
+removed and exit 1 is returned.