feat(kotlin-compose): design system fn.compose:ui + toolbelt android Linux-first

Design system Compose (kotlin/functions/ui, modulo Gradle `fn.compose:ui`):
- FnTokens + FnTheme con la paleta heredada al hex de cpp/DESIGN_SYSTEM.md
  (Mantine v9 dark + indigo), identica a la web @fn_library y a las apps C++.
- 26 componentes Compose (Layout/Display/Inputs/Feedback/Data/Charts) +
  FnTheme + FnTokens registrados en el registry (28 entradas kind=component
  lang=kt domain=ui), descubribles via fn_search. Habilitan init_kotlin_app.

Recuperacion: el commit cb6d9e6 habia anadido `kotlin/functions/ui/` al
.gitignore, por eso el design system nunca se versiono y se perdio del working
tree. Des-ignorado; el .gitignore interno del modulo ya excluye
build/.gradle/local.properties. La gallery (apps/gallery_kt) se recupero del
sub-repo Gitea y sus 27 componentes se reconstruyeron con su MainActivity como
contrato exacto.

Toolbelt Android Linux-first (antes asumia WSL2 + Windows):
- adb_wsl 1.1.0, android_emulator_start 1.1.0, android_emulator_list 1.1.0:
  resuelven adb/emulator nativos del SDK ($ANDROID_HOME), .exe solo fallback WSL2.
- android_emulator_start: fix `timeout adb_run wait-for-device` (timeout no puede
  ejecutar una funcion del shell; ahora invoca el binario $ADB directamente).
- install_android_sdk 1.0.1: fix licencias bajo pipefail (SIGPIPE de `yes`) +
  trap EXIT con variable unbound.
- docs/capabilities/android.md regenerado Linux-first + seccion design system.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

kotlin/functions/ui/build.gradle.kts

@@ -0,0 +1,43 @@
+plugins {
+    id("com.android.library") version "8.4.0"
+    id("org.jetbrains.kotlin.android") version "1.9.22"
+}
+
+// group:name must match the `fn.compose:ui` module notation that apps substitute.
+group = "fn.compose"
+version = "0.1.0"
+
+android {
+    namespace = "fn.compose.ui"
+    compileSdk = 34
+
+    defaultConfig {
+        minSdk = 24
+        consumerProguardFiles("consumer-rules.pro")
+    }
+
+    buildFeatures {
+        compose = true
+    }
+    composeOptions {
+        kotlinCompilerExtensionVersion = "1.5.8"
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+    kotlinOptions {
+        jvmTarget = "17"
+    }
+}
+
+dependencies {
+    // `api` so consuming apps inherit Compose transitively through fn.compose:ui.
+    implementation(platform("androidx.compose:compose-bom:2024.02.00"))
+    api("androidx.compose.ui:ui")
+    api("androidx.compose.ui:ui-graphics")
+    api("androidx.compose.ui:ui-text")
+    api("androidx.compose.foundation:foundation")
+    api("androidx.compose.material3:material3")
+    api("androidx.compose.ui:ui-tooling-preview")
+}