chore: icônes de bundle, packaging Flatpak et bump version 0.1.2

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

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "Pena",
-  "version": "0.1.0",
+  "version": "0.1.2",
   "identifier": "com.pena.app",
   "build": {
     "frontendDist": "../src"
@@ -24,6 +24,12 @@
   "bundle": {
     "active": false,
     "targets": "all",
-    "icon": []
+    "icon": [
+      "icons/32x32.png",
+      "icons/128x128.png",
+      "icons/128x128@2x.png",
+      "icons/icon.icns",
+      "icons/icon.ico"
+    ]
   }
 }