themable prompt and some proposed themes

profile.d/themes/abyss.theme

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+# Abyss prompt theme — deep ocean navy, electric teal, golden accents
+# ------------------------------------------------------------------------------
+# Theme files are NOT executed as shell scripts. load_theme() parses them
+# line by line. Only the following value forms are accepted:
+#
+#   KEY="$ColorVarName"    — reference to a colour variable from disp.sh
+#   KEY="${ColorVarName}"  — same with braces
+#   KEY="\e[...m"          — raw ANSI escape sequence (single block)
+#
+# Accepted keys:
+#   PROMPT_COLOR_*         — prompt slot colours (see profile.conf [prompt])
+#   Standard colour vars   — Black, Blue, On_IBlack, … (overrides the palette
+#                            from disp.sh for the whole shell session)
+#
+# Any unknown key, unsafe value, or shell construct will be ignored with a
+# warning — theme files cannot execute code.
+# ------------------------------------------------------------------------------
+# Inspired by the VS Code "Abyss" theme: deep navy/black backdrop, electric
+# teal highlights, golden-yellow accents, cool electric blue for identifiers.
+# Palette overrides shift the cooler hues to their high-intensity (electric)
+# equivalents — blue becomes IBlue, green shifts toward teal (ICyan).
+# ------------------------------------------------------------------------------
+
+# Palette overrides — shift colours toward cool electric hues
+Blue="\e[0;94m"         # electric blue  (IBlue — abyss identifier colour)
+Green="\e[0;96m"        # teal           (ICyan — abyss string colour)
+Yellow="\e[0;93m"       # bright gold    (IYellow — abyss constant colour)
+
+PROMPT_COLOR_TIME_FG="$ICyan"        # electric teal clock
+PROMPT_COLOR_TIME_BG="$On_Black"     # deep black background
+PROMPT_COLOR_BAR_BG="$On_Blue"       # deep blue bar
+
+PROMPT_COLOR_OK_FG="$ICyan"          # teal on success
+PROMPT_COLOR_OK_MARK="$IGreen"       # bright teal-green checkmark
+
+PROMPT_COLOR_ERR_BG="$On_Red"        # red background on failure
+PROMPT_COLOR_ERR_FG="$IWhite"        # bright white text
+PROMPT_COLOR_ERR_MARK="$IYellow"     # golden X
+
+PROMPT_COLOR_ROOT_FG="$IRed"         # red for root
+PROMPT_COLOR_USER_FG="$IBlue"        # electric blue for user
+PROMPT_COLOR_DIR_FG="$ICyan"         # teal path