feat: add optional mood to thoughts with custom moods support

Mood is an optional label+emoji string (e.g. "relaxed 😌") on thoughts.
Users can define up to 8 custom moods in profile settings.
Mood federates via AP Note JSON and displays on thought cards.

crates/domain/src/models/thought.rs

@@ -22,6 +22,7 @@ pub struct Thought {
     pub created_at: DateTime<Utc>,
     pub updated_at: Option<DateTime<Utc>>,
     pub note_extensions: Option<serde_json::Value>,
+    pub mood: Option<String>,
 }
 
 impl Visibility {
@@ -55,6 +56,7 @@ pub struct NewThought {
     pub visibility: Visibility,
     pub content_warning: Option<String>,
     pub sensitive: bool,
+    pub mood: Option<String>,
 }
 
 impl Thought {
@@ -71,6 +73,7 @@ impl Thought {
             created_at: Utc::now(),
             updated_at: None,
             note_extensions: None,
+            mood: p.mood,
         }
     }
 }

crates/domain/src/models/user.rs

@@ -9,6 +9,7 @@ pub struct UpdateProfileInput {
     pub header_url: Option<String>,
     pub custom_css: Option<String>,
     pub profile_fields: Option<Vec<(String, String)>>,
+    pub custom_moods: Option<Vec<(String, String)>>,
 }
 
 #[derive(Debug, Clone)]
@@ -23,6 +24,7 @@ pub struct User {
     pub header_url: Option<String>,
     pub custom_css: Option<String>,
     pub profile_fields: Vec<(String, String)>,
+    pub custom_moods: Vec<(String, String)>,
     pub local: bool,
     pub created_at: DateTime<Utc>,
     pub updated_at: DateTime<Utc>,
@@ -47,6 +49,7 @@ impl User {
             header_url: None,
             custom_css: None,
             profile_fields: vec![],
+            custom_moods: vec![],
             local: true,
             created_at: now,
             updated_at: now,
@@ -66,6 +69,7 @@ impl User {
             header_url: None,
             custom_css: None,
             profile_fields: vec![],
+            custom_moods: vec![],
             local: false,
             created_at: now,
             updated_at: now,