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Also refactor damus app usage to only pass in things that we need in views.

Signed-off-by: William Casarin <jb55@jb55.com>

src/post.rs

@@ -1,12 +1,17 @@
+use enostr::FullKeypair;
 use nostrdb::{Note, NoteBuilder, NoteReply};
 use std::collections::HashSet;
 
 pub struct NewPost {
     pub content: String,
-    pub account: usize,
+    pub account: FullKeypair,
 }
 
 impl NewPost {
+    pub fn new(content: String, account: FullKeypair) -> Self {
+        NewPost { content, account }
+    }
+
     pub fn to_note(&self, seckey: &[u8; 32]) -> Note {
         NoteBuilder::new()
             .kind(1)