feat: Allow notes to have empty or null titles by updating schema, API validation, and frontend forms.

notes-api/src/dto.rs

@@ -10,7 +10,7 @@ use notes_domain::{Note, Tag};
 /// Request to create a new note
 #[derive(Debug, Deserialize, Validate)]
 pub struct CreateNoteRequest {
-    #[validate(length(min = 1, max = 200, message = "Title must be 1-200 characters"))]
+    #[validate(length(max = 200, message = "Title must be at most 200 characters"))]
     pub title: String,
 
     #[serde(default)]
@@ -29,7 +29,7 @@ pub struct CreateNoteRequest {
 /// Request to update an existing note (all fields optional)
 #[derive(Debug, Deserialize, Validate)]
 pub struct UpdateNoteRequest {
-    #[validate(length(min = 1, max = 200, message = "Title must be 1-200 characters"))]
+    #[validate(length(max = 200, message = "Title must be at most 200 characters"))]
     pub title: Option<String>,
 
     pub content: Option<String>,