- 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
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