style(config): update UI theme colors, borders, and accent palette

dot_config/herdr/config.toml

@@ -1,5 +1,43 @@
 onboarding = false
 
+[ui]
+# Borderless, like the compositor: panes are told apart by the gap between them
+# and by the terminal background, not by a drawn frame. Hyprland already puts a
+# gradient border around the window; a second frame inside it is noise.
+pane_borders = false
+pane_outer_borders = false
+
+accent = "#5ea1ff"
+
+[theme]
+name = "terminal"
+auto_switch = false
+
+[theme.custom]
+# Panes keep the terminal's own background, so kitty's translucency, and the
+# Hyprland blur under it, survive inside herdr.
+panel_bg = "reset"
+
+# Surfaces: bg for the spaces rail, bg_alt for the row under the cursor,
+# bg_highlight for selection — the same three-step ramp as the rest of the theme.
+sidebar_bg = "#16181a"
+active_row_bg = "#1e2124"
+selection_bg = "#3c4048"
+
+# `accent` fills the active tab and `surface_dim` writes its label, so the pair
+# is set to the same plate kitty's tab bar uses: the accent mixed 20% into the
+# background, with the accent itself for the title. A raw #5ea1ff fill would put
+# a neon block above the panes and swallow the label.
+accent = "#243348"
+surface_dim = "#5ea1ff"
+
+# Agent-state marks.
+green = "#5eff6c"
+yellow = "#f1ff5e"
+red = "#ff6e5e"
+peach = "#ffbd5e"
+mauve = "#bd5eff"
+
 [ui.toast]
 delivery = "system"
 
@@ -114,38 +152,3 @@ type = "shell"
 command = '"${HERDR_BIN_PATH}" plugin pane open --plugin official.browser --entrypoint browser --placement overlay --focus'
 description = "open browser overlay"
 
-[ui]
-# The tab strip: `ui.accent` fills the active tab. Solid `#5ea1ff` puts a raw
-# neon block above the panes, so this is the same plate kitty's tab bar uses —
-# the accent mixed 20% into the background — and the label on top of it is the
-# accent itself (see `surface_dim` below).
-accent = "#00ff00"
-
-[theme]
-name = "terminal"
-auto_switch = false
-
-[theme.custom]
-# Panes keep the terminal's own background, so kitty's translucency, and the
-# Hyprland blur under it, survive inside herdr.
-panel_bg = "reset"
-
-# Surfaces: bg for the spaces rail, bg_alt for the row under the cursor,
-# bg_highlight for selection — the same three-step ramp as the rest of the theme.
-sidebar_bg = "#16181a"
-active_row_bg = "#1e2124"
-selection_bg = "#3c4048"
-
-# One token paints both the sidebar/panel rule and the active tab's label, so it
-# has to read as a lit edge on #16181a and as text on the tab plate: the accent
-# does both, and matches kitty's accent-colored active tab title.
-surface_dim = "#5ea1ff"
-
-accent = "#5ea1ff"
-
-# Agent-state marks.
-green = "#5eff6c"
-yellow = "#f1ff5e"
-red = "#ff6e5e"
-peach = "#ffbd5e"
-mauve = "#bd5eff"