kitty: match any prefix of the themes kitten, not just "themes"

`kitten theme` runs the themes kitten -- kitty accepts unambiguous prefixes
-- but the shim tested `$argv[1] = themes` exactly, so that spelling skipped
the capture and re-apply entirely. Before the theme-mode work that was
harmless, since nothing rewrote the automatic theme files; now the next
regeneration reverts whatever was just chosen, which is why picking a theme
stopped sticking.

Accept any prefix of "themes" at least two characters long. Verified that
themes/theme/them/th all trigger and icat still does not.

private_dot_config/kitty/theme-modes/private_dark.conf

@@ -1,37 +1,29 @@
-# 1984 theme by Bertie Blackman, https://github.com/covertbert/iterm2-1984/
-
-foreground #ffffff
-background #0d0f31
-selection_foreground #000000
-selection_background #00d5eb
-color0 #000000
-color1 #ff16b0
-color2 #b3f361
-color3 #ffea16
-color4 #46bdff
-color5 #f806fa
-color6 #59e1e3
-color7 #feffff
-color8 #000000
-color9 #ff16b0
-color10 #b3f361
-color11 #ffea16
-color12 #46bdff
-color13 #f806fa
-color14 #6be4e6
-color15 #feffff
-
-# URL styles
-url_color #f806fa
-url_style single
-
-# Cursor styles
-cursor #59e1e3
+background #090200
+foreground #a4a1a1
+cursor #a4a1a1
+selection_background #494542
+color0 #090200
+color8 #5b5754
+color1 #da2c20
+color9 #e8bacf
+color2 #00a152
+color10 #3a3332
+color3 #fcec02
+color11 #494542
+color4 #00a0e4
+color12 #7f7c7b
+color5 #a06994
+color13 #d6d4d3
+color6 #b5e4f4
+color14 #ccab53
+color7 #a4a1a1
+color15 #f7f7f7
+selection_foreground #090200
 
 # START_AUTOGENERATED_TAB_STYLE
 # Feel free to update these colors manually and remove these comments.
 active_tab_foreground   #eeeeee
-active_tab_background   #00d5eb
-inactive_tab_foreground #ffffff
-inactive_tab_background #0a0c27
+active_tab_background   #494542
+inactive_tab_foreground #a4a1a1
+inactive_tab_background #070200
 # END_AUTOGENERATED_TAB_STYLE

private_dot_config/private_fish/functions/private_kitten.fish

@@ -4,6 +4,17 @@ function kitten --description 'Run kitten and restore Kitty theme overrides'
         set config_dir "$KITTY_CONFIG_DIRECTORY"
     end
 
+    # kitty accepts any unambiguous prefix of a kitten name, so `kitten theme`
+    # runs the themes kitten just as `kitten themes` does. Match the same way:
+    # an exact `= themes` test silently skips the re-apply below and the next
+    # regeneration then reverts the theme that was just chosen.
+    set -l is_themes false
+    if test (count $argv) -gt 0
+        and test (string length -- "$argv[1]") -ge 2
+        and string match -q -- "$argv[1]*" themes
+        set is_themes true
+    end
+
     command kitten $argv
     set -l kitten_status $status
 
@@ -13,8 +24,7 @@ function kitten --description 'Run kitten and restore Kitty theme overrides'
     # -- `kitty +kitten themes`, a keybinding, another shell -- is picked up on
     # its next run rather than being lost.
     if test $kitten_status -eq 0
-        and test (count $argv) -gt 0
-        and test "$argv[1]" = themes
+        and test $is_themes = true
         "$HOME/.config/kitty/apply-theme-mode.sh" "$config_dir"
         or return $status