refactor: major architectural restructure for theme-centric organization

Theme System:
- Move all theme app configs to apps/ subdirectory (20 themes)
- Add theme-loader.nix for dynamic theme config deployment
- Simplify stylix.nix to focus on base theming only

Override System:
- Add overrides.nix for file-based config overrides
- Add behavior-configs.nix for non-visual configuration
- Split hypr/nomarchy.conf into behavior vs visual sections

Module Improvements:
- Add lib.mkDefault to all customizable settings
- Add modules/lib/ with shared utilities and state schema
- Update all home and system modules for downstream overridability

Installer:
- New minimal TTY installer (installer/install.sh)
- Golden path: BTRFS + LUKS2 (disko-golden.nix)
- New installer-iso.nix for TTY-only installation
- Keep graphical installer as installerIsoGraphical option

Cleanup:
- Remove obsolete install.sh, disko-ext4.nix, install-nomarchy.sh
- Update live-iso.nix references
- Add .claude/ to .gitignore for local IDE settings

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

bin/utils/nomarchy-menu

@@ -247,6 +247,7 @@ show_setup_config_menu() {
   *Walker*) open_in_editor ~/.config/walker/config.toml && nomarchy-restart-walker ;;
   *Waybar*) open_in_editor ~/.config/waybar/config.jsonc && nomarchy-restart-waybar ;;
   *XCompose*) open_in_editor ~/.XCompose && nomarchy-restart-xcompose ;;
+  *Overrides*) xdg-open ~/.config/nomarchy/overrides/ ;;
   *) show_setup_menu ;;
   esac
 }

bin/utils/nomarchy-migrate-state

@@ -0,0 +1,54 @@
+#!/usr/bin/env bash
+# Nomarchy State Migration Script
+# Migrates state from old locations to unified ~/.config/nomarchy/state.json
+
+set -e
+
+NEW_STATE_DIR="$HOME/.config/nomarchy"
+NEW_STATE_FILE="$NEW_STATE_DIR/state.json"
+OLD_HOME_STATE="$HOME/.config/home-manager/state.json"
+OLD_SYSTEM_STATE="/etc/nixos/state.json"
+
+mkdir -p "$NEW_STATE_DIR"
+
+# Initialize new state file if it doesn't exist
+if [[ ! -f "$NEW_STATE_FILE" ]]; then
+    echo "{}" > "$NEW_STATE_FILE"
+fi
+
+# Function to safely merge JSON
+merge_json() {
+    local source="$1"
+    if [[ -f "$source" ]]; then
+        echo "Migrating from $source..."
+        TMP_FILE=$(mktemp)
+        # Merge source into new state (new state values take precedence if conflict)
+        jq -s '.[0] * .[1]' "$source" "$NEW_STATE_FILE" > "$TMP_FILE" && mv "$TMP_FILE" "$NEW_STATE_FILE"
+    fi
+}
+
+# Migrate old home-manager state
+if [[ -f "$OLD_HOME_STATE" ]] && [[ "$OLD_HOME_STATE" != "$NEW_STATE_FILE" ]]; then
+    merge_json "$OLD_HOME_STATE"
+    echo "Old home state migrated. You can remove: $OLD_HOME_STATE"
+fi
+
+# Check if system state exists and user wants to sync it
+if [[ -f "$OLD_SYSTEM_STATE" ]]; then
+    echo ""
+    echo "System state found at $OLD_SYSTEM_STATE"
+    echo "Note: System state will continue to be read from /etc/nixos/state.json"
+    echo "      for system-level NixOS configuration."
+fi
+
+# Run the preflight migration for any legacy formats
+if command -v nomarchy-preflight-migration &> /dev/null; then
+    nomarchy-preflight-migration
+fi
+
+echo ""
+echo "Migration complete!"
+echo "New state location: $NEW_STATE_FILE"
+echo ""
+echo "Current state:"
+jq '.' "$NEW_STATE_FILE"

bin/utils/nomarchy-state-write

@@ -0,0 +1,100 @@
+#!/usr/bin/env bash
+# Nomarchy Atomic State Write Helper
+# Provides atomic JSON state updates with flock to prevent race conditions
+#
+# Usage:
+#   nomarchy-state-write <key> <value> [--type string|bool|number|json]
+#   nomarchy-state-write --file <path> <key> <value> [--type ...]
+#
+# Examples:
+#   nomarchy-state-write theme "nord"
+#   nomarchy-state-write idle true --type bool
+#   nomarchy-state-write hyprland '{"gaps_in": 5}' --type json
+#   nomarchy-state-write --file /etc/nixos/state.json dns "Cloudflare"
+
+set -e
+
+# Default state file
+STATE_FILE="$HOME/.config/nomarchy/state.json"
+VALUE_TYPE="string"
+
+# Parse arguments
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        --file)
+            STATE_FILE="$2"
+            shift 2
+            ;;
+        --type)
+            VALUE_TYPE="$2"
+            shift 2
+            ;;
+        *)
+            if [[ -z "$KEY" ]]; then
+                KEY="$1"
+            elif [[ -z "$VALUE" ]]; then
+                VALUE="$1"
+            fi
+            shift
+            ;;
+    esac
+done
+
+if [[ -z "$KEY" ]] || [[ -z "$VALUE" ]]; then
+    echo "Usage: nomarchy-state-write <key> <value> [--type string|bool|number|json]"
+    echo "       nomarchy-state-write --file <path> <key> <value> [--type ...]"
+    exit 1
+fi
+
+# Ensure directory exists
+mkdir -p "$(dirname "$STATE_FILE")"
+
+# Initialize file if it doesn't exist
+[[ ! -f "$STATE_FILE" ]] && echo "{}" > "$STATE_FILE"
+
+# Create lock file path
+LOCK_FILE="${STATE_FILE}.lock"
+
+# Perform atomic update with flock
+(
+    flock -x 200
+
+    TMP_FILE=$(mktemp)
+    trap "rm -f '$TMP_FILE'" EXIT
+
+    case "$VALUE_TYPE" in
+        string)
+            jq --arg val "$VALUE" ".$KEY = \$val" "$STATE_FILE" > "$TMP_FILE"
+            ;;
+        bool)
+            if [[ "$VALUE" == "true" ]] || [[ "$VALUE" == "false" ]]; then
+                jq --argjson val "$VALUE" ".$KEY = \$val" "$STATE_FILE" > "$TMP_FILE"
+            else
+                echo "Error: Boolean value must be 'true' or 'false'"
+                exit 1
+            fi
+            ;;
+        number)
+            jq --argjson val "$VALUE" ".$KEY = \$val" "$STATE_FILE" > "$TMP_FILE"
+            ;;
+        json)
+            jq --argjson val "$VALUE" ".$KEY = \$val" "$STATE_FILE" > "$TMP_FILE"
+            ;;
+        *)
+            echo "Error: Unknown type '$VALUE_TYPE'. Use string, bool, number, or json."
+            exit 1
+            ;;
+    esac
+
+    # Validate JSON before moving
+    if jq empty "$TMP_FILE" 2>/dev/null; then
+        mv "$TMP_FILE" "$STATE_FILE"
+    else
+        echo "Error: Failed to generate valid JSON"
+        exit 1
+    fi
+
+) 200>"$LOCK_FILE"
+
+# Clean up lock file
+rm -f "$LOCK_FILE"