feat: Chat Folder (#766)

# PR Checklist
- [x] Have you checked if it works normally in all models? *Ignore this
if it doesn't use models.*
- [x] Have you checked if it works normally in all web, local, and node
hosted versions? If it doesn't, have you blocked it in those versions?
- [x] Have you added type definitions?

# Description

<img width="369" alt="스크린샷 2025-02-19 오후 5 11 42"
src="https://github.com/user-attachments/assets/f6819d88-e417-47d4-9f69-888e9aab21f7"
/>
<img width="369" alt="스크린샷 2025-02-19 오후 5 11 54"
src="https://github.com/user-attachments/assets/b867f97e-f9bb-4964-ba9e-a34171e79ffe"
/>

이 PR은 챗을 분류하는 폴더를 추가합니다. 폴더에는 색상을 넣을 수 있습니다.

This PR adds a folder to categorize chats. Folders can be colored. I'm
open to any feedback or suggestions.

src/ts/storage/database.svelte.ts

@@ -979,6 +979,7 @@ export interface character{
     desc:string
     notes:string
     chats:Chat[]
+    chatFolders: ChatFolder[]
     chatPage: number
     viewScreen: 'emotion'|'none'|'imggen'|'vn',
     bias: [string, number][]
@@ -1117,6 +1118,7 @@ export interface groupChat{
     image?:string
     firstMessage:string
     chats:Chat[]
+    chatFolders: ChatFolder[]
     chatPage: number
     name:string
     viewScreen: 'single'|'multiple'|'none'|'emp',
@@ -1324,6 +1326,14 @@ export interface Chat{
     bindedPersona?:string
     fmIndex?:number
     hypaV3Data?:SerializableHypaV3Data
+    folderId?:string
+}
+
+export interface ChatFolder{
+    id:string
+    name?:string
+    color?:string
+    folded:boolean
 }
 
 export interface Message{