feat: Ford legacy support, EMEX browser pooling, collapsible sidebar

- Add PL24 Ford legacy service for fordt_parts architecture
- Refactor EMEX to use persistent browser pool instead of per-call instances
- Make vehicle decode resilient: fallback to PL24 when Corgi doesn't recognize VIN
- Add collapsible sidebar with persistent user preference
- Improve brand access guard and categories service
- Add debug/test scripts for VIN e2e testing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/emex-debug-dims.js

@@ -0,0 +1,43 @@
+#!/usr/bin/env node
+const puppeteer = require('puppeteer');
+const QUICK_URL = 'https://emexdwc.ae/QuickDetails.aspx?c=SUBARU201802&gid=11884&vid=0&ssd=$*KwGdqbit1suR0ubYx-jFj8XR8fbomJ-emYinlNza6f7m4Nf0houS7-TvmejqkOewy9Ponp-Rlp6c1YC4n43Hi5KN5O-asbzd4-ian-ien5LPyNGNgovNjZSYmsXOyI3Xi5KN6IvWAAAAAHBDYDE=$';
+
+(async () => {
+    const browser = await puppeteer.launch({ headless: 'new', args: ['--no-sandbox'] });
+    const page = await browser.newPage();
+    await page.setViewport({ width: 1400, height: 900 });
+    await page.goto(QUICK_URL, { waitUntil: 'networkidle2', timeout: 30000 });
+    await new Promise(r => setTimeout(r, 2000));
+
+    const unitUrl = await page.evaluate(() => {
+        const link = document.querySelector('a[href*="Unit.aspx"]');
+        return link ? link.href : null;
+    });
+    await page.goto(unitUrl, { waitUntil: 'networkidle2', timeout: 30000 });
+    await new Promise(r => setTimeout(r, 3000));
+
+    const info = await page.evaluate(() => {
+        const img = document.querySelector('img.dragger[src*="laximo"]');
+        if (!img) return { error: 'no dragger img' };
+
+        return {
+            naturalWidth: img.naturalWidth,
+            naturalHeight: img.naturalHeight,
+            offsetWidth: img.offsetWidth,
+            offsetHeight: img.offsetHeight,
+            clientWidth: img.clientWidth,
+            clientHeight: img.clientHeight,
+            // Also check the image container
+            parentTag: img.parentElement?.tagName,
+            parentClass: img.parentElement?.className,
+            parentWidth: img.parentElement?.offsetWidth,
+            parentHeight: img.parentElement?.offsetHeight,
+            // Scale factor
+            scaleX: img.naturalWidth / img.offsetWidth,
+            scaleY: img.naturalHeight / img.offsetHeight,
+        };
+    });
+
+    console.log(JSON.stringify(info, null, 2));
+    await browser.close();
+})();