feat: refactor monolithic App.vue into modular Vue component architecture

- Extract 711-line App.vue into 15+ focused files across 5 directories
- Add data layer (icons, metrics, policies, auditTrail, requests)
- Add composables (useNavigation, useRequests, useChat, useToast)
- Add layout components (SidebarRail, TopBar, FilterBar)
- Add shared components (PanelHead, InfoRow, ToastNotification)
- Add business component (RequestTable) and 5 view components
- Extract global CSS to assets/styles/global.css
- Add start.sh with WSL/Windows cross-platform support
- Add .gitignore for node_modules, dist, and IDE dirs

start.sh

@@ -0,0 +1,97 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# ============================================================
+# X-Financial Reimbursement Admin - Start Script
+# ============================================================
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+cd "$SCRIPT_DIR"
+
+# Colors
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m'
+
+info()  { echo -e "${GREEN}[INFO]${NC} $*"; }
+warn()  { echo -e "${YELLOW}[WARN]${NC} $*"; }
+error() { echo -e "${RED}[ERROR]${NC} $*"; exit 1; }
+
+# ----------------------------------------------------------
+# Check Node.js
+# ----------------------------------------------------------
+if ! command -v node &>/dev/null; then
+    error "Node.js is not installed. Install it first: https://nodejs.org"
+fi
+
+if ! command -v npm &>/dev/null; then
+    error "npm is not installed. It should come with Node.js."
+fi
+
+info "Node.js $(node -v) | npm $(npm -v)"
+
+# ----------------------------------------------------------
+# Detect WSL + Windows node_modules platform mismatch
+# ----------------------------------------------------------
+is_wsl() {
+    grep -qi microsoft /proc/version 2>/dev/null
+}
+
+check_platform_mismatch() {
+    local rollup_dir="node_modules/@rollup"
+    if [ ! -d "$rollup_dir" ]; then
+        return 1
+    fi
+    # List installed rollup platform packages
+    local platforms
+    platforms="$(ls -1 "$rollup_dir" 2>/dev/null | grep -E '^rollup-(win|linux)')"
+    if [ -z "$platforms" ]; then
+        return 1
+    fi
+    # Running on WSL/Linux but has Windows rollup bindings
+    if echo "$platforms" | grep -q "win32"; then
+        return 0
+    fi
+    return 1
+}
+
+# ----------------------------------------------------------
+# Install dependencies if node_modules is missing or mismatched
+# ----------------------------------------------------------
+NEED_INSTALL=false
+
+if [ ! -d "node_modules" ]; then
+    warn "node_modules not found"
+    NEED_INSTALL=true
+elif is_wsl && check_platform_mismatch; then
+    warn "Detected WSL with Windows node_modules (rollup platform mismatch)"
+    warn "Removing node_modules to reinstall with correct platform bindings..."
+    # WSL can't delete locked Windows .exe/.node files, use PowerShell instead
+    WIN_PATH="$(wslpath -w "$SCRIPT_DIR")"
+    if command -v powershell.exe &>/dev/null; then
+        powershell.exe -NoProfile -Command "Remove-Item -Recurse -Force '${WIN_PATH}\\node_modules','${WIN_PATH}\\package-lock.json'" 2>/dev/null || true
+    elif command -v cmd.exe &>/dev/null; then
+        cmd.exe /c "rd /s /q \"${WIN_PATH}\\node_modules\"" 2>/dev/null || true
+        cmd.exe /c "del /f /q \"${WIN_PATH}\\package-lock.json\"" 2>/dev/null || true
+    else
+        rm -rf node_modules package-lock.json 2>/dev/null || true
+    fi
+    # Fallback: clean up anything remaining via WSL
+    rm -rf node_modules package-lock.json 2>/dev/null || true
+    NEED_INSTALL=true
+fi
+
+if [ "$NEED_INSTALL" = true ]; then
+    info "Running npm install..."
+    npm install
+fi
+
+# ----------------------------------------------------------
+# Start dev server
+# ----------------------------------------------------------
+info "Starting X-Financial Reimbursement Admin..."
+info "Access: http://127.0.0.1:5173"
+echo ""
+
+exec npm start