CSS tweaks:

- resized addbg3.png from 1600x1600 to 160x90
- added trans grey border to right nav, to match chat and send_form
- reduced opacity of chat/sendform >> 70% to 50%
- reduced blur on chat/sendform >> 20px to 10px
- added 1px gap between chat and right nav to match chat/sendform
- fixed add_bg button being too tall and skewing top bg row on mobile
- 2 new utility classes no-border and no-shadow
- made drawer heights match chat+sendform height on mobile

/img cleanup:
- removed unused files from /img
- resized large UI-only PNG files to 100px x 100px
- replaced fluffy.png with a custom PNG 'ai4.png'
- total /img footprint is now 615kb  (compared to 3.5MB in main tai 1.3)
-- /default-expressions 509kb
-- everything else 106kb

public/script.js

@@ -148,7 +148,7 @@ let characters = [];
 let this_chid;
 let active_character;
 let backgrounds = [];
-const default_avatar = "img/fluffy.png";
+const default_avatar = "img/ai4.png";
 const system_avatar = "img/five.png";
 let is_colab = false;
 let is_checked_colab = false;
@@ -1606,7 +1606,7 @@ async function Generate(type, automatic_trigger, force_name2) {//encode("dsfs").
 
                             if (selected_group) {
                                 console.log('entering chat update for groups');
-                                let avatarImg = 'img/fluffy.png';
+                                let avatarImg = 'img/ai4.png';
                                 if (characters[this_chid].avatar != 'none') {
                                     avatarImg = `characters/${characters[this_chid].avatar}?${Date.now()}`;
                                 }