feat: add multi-select notes and Gemini AI integration

- Implemented multi-selection for notes with Ctrl+click, long-press, and keyboard shortcuts (Ctrl+A, Escape)
- Added Gemini API integration with environment configuration and routes
- Enhanced code block UI with improved copy feedback animation and visual polish
- Added sort order toggle (asc/desc) for note lists with persistent state

vault/toto/Nouvelle note 2.md

@@ -1,12 +1,11 @@
 ---
-titre: Nouvelle note 2
-auteur: Bruno Charest
-creation_date: 2025-10-24T12:24:03.706Z
-modification_date: 2025-10-24T08:24:04-04:00
-catégorie: ""
-tags: []
-aliases: []
-status: en-cours
+titre: "Nouvelle note 2"
+auteur: "Bruno Charest"
+creation_date: "2025-10-24T12:24:03.706Z"
+modification_date: "2025-10-24T08:24:04-04:00"
+tags: [""]
+aliases: [""]
+status: "en-cours"
 publish: false
 favoris: false
 template: false
@@ -14,4 +13,5 @@ task: false
 archive: false
 draft: false
 private: false
+color: "#22C55E"
 ---