Follow the active theme in T3 Code

T3 Code reads themes an environment publishes into its state directory, so
a generated t3code.json carries the palette the same way claude.json and
vscode-theme.json already do, and omarchy-theme-set-t3code republishes it
on every theme change for the app to pick up live.

The template overrides only the roles a theme actually designs -- terminal
and code surfaces, text on canvas, borders, selection -- and leaves muted
text, placeholders, and status foregrounds to T3 Code, which contrast-solves
them against whatever canvas it is given. Overriding those directly cost
readability on light themes: White fell to 1.0:1 on placeholder text.

Installing from the menu now routes through omarchy-install-ai-t3-code so a
fresh install publishes the current palette and opens wearing it.

bin/omarchy-install-ai-t3-code

@@ -0,0 +1,49 @@
+#!/bin/bash
+
+# omarchy:summary=Install T3 Code and point it at the Omarchy palette
+# omarchy:requires-sudo=true
+
+set -e
+
+T3CODE_HOME="${T3CODE_HOME:-$HOME/.t3}"
+T3CODE_STATE_DIR="$T3CODE_HOME/userdata"
+T3CODE_SETTINGS_PATH="$T3CODE_STATE_DIR/settings.json"
+
+# Ask T3 Code to open on the palette this machine publishes. `t3 theme set`
+# is the supported way, but the desktop package ships only the GUI -- the CLI
+# is a separate npm distribution -- so fall back to the setting it writes.
+# Both run before the first launch, so neither races a running server.
+set_default_theme() {
+  if command -v t3 >/dev/null 2>&1; then
+    t3 theme set omarchy --base-dir "$T3CODE_HOME" >/dev/null && return
+  fi
+
+  local tmp
+  mkdir -p "$T3CODE_STATE_DIR"
+  [[ -f $T3CODE_SETTINGS_PATH ]] || echo '{}' >"$T3CODE_SETTINGS_PATH"
+
+  tmp=$(mktemp "$T3CODE_SETTINGS_PATH.XXXXXX")
+  if jq '.defaultTheme = "omarchy"' "$T3CODE_SETTINGS_PATH" >"$tmp"; then
+    mv "$tmp" "$T3CODE_SETTINGS_PATH"
+  else
+    rm -f "$tmp"
+    echo "Could not set the default theme in $T3CODE_SETTINGS_PATH." >&2
+  fi
+}
+
+echo "Installing T3 Code..."
+omarchy-pkg-add t3code-bin
+
+# The palette itself, and the request to open on it, are both first-run
+# concerns. `defaultTheme` only decides what a client with no theme of its own
+# starts on, so choosing a theme in T3 Code later is never overridden.
+echo "Matching T3 Code to the current theme..."
+mkdir -p "$T3CODE_STATE_DIR"
+omarchy-theme-set-t3code
+set_default_theme
+
+echo "Opening T3 Code..."
+setsid uwsm-app -- gtk-launch t3code >/dev/null 2>&1 &
+
+echo ""
+echo "T3 Code has been installed."

bin/omarchy-theme-set

@@ -372,6 +372,7 @@ post_theme_commands=(
   omarchy-theme-set-pi
   omarchy-theme-set-claude
   omarchy-theme-set-hermes
+  omarchy-theme-set-t3code
   omarchy-theme-set-browser
   omarchy-theme-set-vscode
   omarchy-theme-set-obsidian

bin/omarchy-theme-set-t3code

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+# omarchy:summary=Sync the generated Omarchy theme to T3 Code
+# omarchy:hidden=true
+
+set -euo pipefail
+
+T3CODE_SOURCE_PATH="$HOME/.local/state/omarchy/current/theme/t3code.json"
+T3CODE_HOME="${T3CODE_HOME:-$HOME/.t3}"
+T3CODE_STATE_DIR="$T3CODE_HOME/userdata"
+# The filename is the theme id T3 Code shows and `t3 theme set` accepts, and
+# it stays stable while the colors change underneath on every theme switch.
+T3CODE_THEME_PATH="$T3CODE_STATE_DIR/themes/omarchy.json"
+
+[[ -f $T3CODE_SOURCE_PATH ]] || exit 0
+
+# A theme without an accent or a background leaves its placeholder unresolved.
+# Publishing that would only make T3 Code reject the file, so skip instead and
+# leave the previous palette in place.
+if grep -q '{{' "$T3CODE_SOURCE_PATH"; then
+  echo "Skipping T3 Code theme: $(basename "$T3CODE_SOURCE_PATH") has unresolved colors." >&2
+  exit 0
+fi
+
+# Only follow an install that already exists. Creating the directory here would
+# leave a stray T3 Code state dir on machines that do not run it.
+[[ -d $T3CODE_STATE_DIR ]] || exit 0
+
+# T3 Code watches this file and retints every connected client on change, so
+# the write has to be atomic: a half-written file would read as invalid.
+mkdir -p "$(dirname "$T3CODE_THEME_PATH")"
+tmp=$(mktemp "$T3CODE_THEME_PATH.XXXXXX")
+cp "$T3CODE_SOURCE_PATH" "$tmp"
+mv "$tmp" "$T3CODE_THEME_PATH"