feat: add message edit time limit and broadcast full record on update

- Add `get_seconds_since_last_update` method to `ChannelMessageModel` for age checking
- Reject edits on messages older than 3 seconds in `updateMessageText` RPC handler
- Broadcast full message record (including html) instead of just text in socket event
- Update frontend `updateMessageText` to parse and set innerHTML from received html field
- Fix CSS selector for chat message images to use descendant combinator
- Add 3-second auto-clear timeout for liveType input field
- Prevent liveType submission on trailing newline or space
- Hide empty messages in channel-message event by setting display none

src/snek/templates/web.html

@@ -47,7 +47,18 @@
         if(textBox.liveType == undefined){
             textBox.liveType = false
         }
+        let typeTimeout = null;
         textBox.addEventListener('keydown',async (e) => {
+            if(typeTimeout){
+                clearTimeout(typeTimeout)
+                typeTimeout = null
+            }
+            if(e.target.liveType){
+                typeTimeout = setTimeout(()=>{
+                    e.target.lastMessageUid = null
+                    e.target.value = ''
+                },3000)
+            }
             if(e.key === "ArrowUp"){
                 const value = findDivAboveText(e.target.value).querySelector('.text')
                 e.target.value = value.textContent
@@ -102,7 +113,9 @@
                 
 	    }else{
 		if(textBox.liveType){
-            
+            if(e.target.value.endsWith("\n") || e.target.value.endsWith(" ")){
+                return
+            } 
             if(e.target.value[0] == "/"){
                 return
             }
@@ -116,8 +129,10 @@
                 return;
             }
             app.rpc.updateMessageText(textBox.lastMessageUid, e.target.value)
+        }else{
+            app.rpc.set_typing(channelUid)
         }
-        app.rpc.set_typing(channelUid)
+
         
 	    }
         });
@@ -294,6 +309,10 @@
     }
 
     app.addEventListener("channel-message", (data) => {
+        let display = 'block';
+        if(!data.text || !data.text.trim()){
+            display = "none";
+        }
         if (data.channel_uid !== channelUid) {
             if(!isMentionForSomeoneElse(data.message)){
                 channelSidebar.notify(data);
@@ -316,6 +335,7 @@
 
         const message = document.createElement("div");
         message.innerHTML = data.html;
+        message.style.display = display
         document.querySelector(".chat-messages").appendChild(message.firstChild);
         updateLayout(doScrollDownBecauseLastMessageIsVisible);
         setTimeout(() => {
@@ -373,6 +393,9 @@
        if(e.target.tagName != 'IMG')
            return
       const img = e.target
+      if(e.target.classList.contains('avatar')){
+          return
+      }
       const overlay = document.createElement('div');
       overlay.style.position = 'fixed';
       overlay.style.top = 0;