feat: integrate @tailwindcss/typography and enhance folder picker functionality

- Added @tailwindcss/typography dependency to package.json and tailwind.config.js.
- Updated FolderPicker.vue to include additional properties (isGitRepo, hasDocuments) for directories.
- Enhanced Sidebar.vue with folder creation and document handling features, including drag-and-drop functionality.
- Implemented createFolder and moveDocument mutations in gql.ts for managing folder and document operations.
- Added logic to handle folder creation and document creation prompts in Sidebar.vue.
- Updated the layout and interactions in Sidebar.vue to improve user experience.

backend/internal/graph/schema.graphql

@@ -14,6 +14,9 @@ type Query {
   # List documents under an optional path prefix.
   documents(prefix: String): [DocumentMeta!]!
 
+  # List all relative folder paths in the repository.
+  folders: [String!]!
+
   # Commit history for a document.
   history(slug: String!): [CommitEntry!]!
 
@@ -25,6 +28,9 @@ type Query {
 
   # Whether the current storage path has uncommitted files.
   repoStatus: RepoStatus!
+
+  # List images next to a document.
+  images(slug: String!): [ImageFile!]!
 }
 
 type Mutation {
@@ -57,6 +63,15 @@ type Mutation {
 
   # Commit all uncommitted files in the storage path.
   initCommit(message: String!): Boolean!
+
+  # Delete an image file.
+  deleteImage(slug: String!, filename: String!): Boolean!
+
+  # Create a new folder (directory) at the specified path.
+  createFolder(path: String!): Boolean!
+
+  # Move a document from one location to another.
+  moveDocument(oldSlug: String!, newSlug: String!): Boolean!
 }
 
 # ── Types ──────────────────────────────────────────────────────────────────────
@@ -79,8 +94,10 @@ type LDAPConfig {
 }
 
 type ServerDirectory {
-  name:   String!
-  path:   String!
+  name:      String!
+  path:      String!
+  isGitRepo: Boolean!
+  hasDocuments: Boolean!
 }
 
 type Document {
@@ -114,6 +131,12 @@ type RepoStatus {
   hasUncommitted: Boolean!
 }
 
+type ImageFile {
+  name: String!
+  url:  String!
+  size: Int!
+}
+
 # ── Inputs ─────────────────────────────────────────────────────────────────────
 
 input SetupInput {