feat: kitty-colors.conf — Sethian terminal palette, cursor trail, padding, opacity

Moved from vjtop's machine-only overlay now that steel141 runs it too.
install-kitty-theme.sh copies + includes it after kitty-theme.conf.
Deployed: steel141 (seth) + vjtop.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

kitty/kitty-colors.conf

@@ -0,0 +1,48 @@
+# Seth Linux Theme — terminal palette + feel (Sethian near-black + #D35400).
+# Include from kitty.conf after kitty-theme.conf: include kitty-colors.conf
+
+# ── Palette: near-black + #D35400 orange ─────────
+foreground            #d8d8d8
+background            #0d0d0d
+selection_foreground  #000000
+selection_background  #D35400
+url_color             #E67E22
+active_border_color   #D35400
+inactive_border_color #333333
+bell_border_color     #ff6b61
+
+color0  #1a1a1a
+color8  #555555
+color1  #e0443e
+color9  #ff6b61
+color2  #8fbf5a
+color10 #a8d672
+color3  #e6a23c
+color11 #f5c26b
+color4  #5a8dd6
+color12 #7aa8ee
+color5  #b86fd0
+color13 #d08fe6
+color6  #4fb8b0
+color14 #6fd6cc
+color7  #c8c8c8
+color15 #f0f0f0
+
+# ── Cursor ───────────────────────────────────────
+cursor                #D35400
+cursor_text_color     #000000
+cursor_shape          beam
+cursor_blink_interval 0.6
+cursor_trail          3
+cursor_trail_decay    0.1 0.4
+
+# ── Window feel ──────────────────────────────────
+window_padding_width       6 10
+background_opacity         0.94
+dynamic_background_opacity yes
+url_style                  curly
+enable_audio_bell          no
+visual_bell_duration       0.15
+visual_bell_color          #D35400
+scrollback_lines           20000
+