fix: side-panel Details button opens full-screen on desktop (#892)

## Symptom
🔍 Details button in the nodes side panel does nothing on click.

## Root cause (4th regression of the same shape)
- Row click → `selectNode()` → `history.replaceState(null, '',
'#/nodes/' + pk)`
- Details button click → `location.hash = '#/nodes/' + pk`
- Hash is already that value → assignment is a no-op → no `hashchange`
event → no router → panel stays open.

## Fix
Mirror the analytics-link branch already inside the panel click handler:
`destroy()` then `init(appEl, pubkey)` directly (which hits the
`directNode` full-screen branch unconditionally). Also `replaceState` to
keep the URL in sync.

## Test
New Playwright E2E: open side panel via row click, click Details, assert
`.node-fullscreen` appears.

## Why this keeps regressing
Every time we tighten the row-click handler to use `replaceState`
(correct — avoids hashchange flicker), the button-click handler that
uses `location.hash` becomes a no-op for the same pubkey. Need to
remember they're coupled. Worth a follow-up to extract a
`navigateToNode(pk)` helper that always works regardless of current hash
state — filing as #890-followup if not already there.

Co-authored-by: you <you@example.com>

public/nodes.js

@@ -1144,6 +1144,19 @@
     makeColumnsResizable('#nodesTable', 'meshcore-nodes-col-widths');
   }
 
+  /**
+   * Navigate to the full-screen node view for `pubkey` from anywhere within
+   * the nodes module. Single source of navigation truth — works regardless
+   * of current hash state (hash assignment alone is a no-op when the hash
+   * is already the target).
+   */
+  function navigateToNode(pubkey) {
+    destroy();
+    var appEl = document.getElementById('app');
+    history.replaceState(null, '', '#/nodes/' + encodeURIComponent(pubkey));
+    init(appEl, pubkey);
+  }
+
   async function selectNode(pubkey) {
     // On mobile, navigate to full-screen node view
     if (window.innerWidth <= 640) {
@@ -1307,12 +1320,11 @@
       } catch {}
     }
 
-    // #856: Wire "Details" button to navigate to full-screen node view
+    // Wire "Details" button via the unified navigateToNode helper
     var detailBtn = panel.querySelector('.node-detail-btn');
     if (detailBtn) {
       detailBtn.addEventListener('click', function() {
-        var pk = detailBtn.getAttribute('data-pubkey');
-        location.hash = '#/nodes/' + pk;
+        navigateToNode(decodeURIComponent(detailBtn.getAttribute('data-pubkey')));
       });
     }
 

test-e2e-playwright.js

@@ -2095,6 +2095,24 @@ async function run() {
     console.log(`    ✓ obs A: ${snapA.pathBytes} path bytes / ${snapA.hopCount} hops; obs B: ${snapB.pathBytes} / ${snapB.hopCount}`);
   });
 
+  // Test: clicking the 🔍 Details button in the nodes side panel navigates to
+  // the full-screen node detail view. Regression: hash already === target,
+  // so location.hash assignment was a no-op and the panel stayed open.
+  await test('Nodes side panel Details button opens full-screen view', async () => {
+    await page.goto(BASE + '#/nodes', { waitUntil: 'domcontentloaded' });
+    await page.waitForSelector('table tbody tr[data-action]', { timeout: 15000 });
+    await page.waitForTimeout(500);
+    // Open side panel
+    await page.click('table tbody tr[data-action]');
+    await page.waitForSelector('#nodesRight .node-detail-btn', { timeout: 5000 });
+    // Click Details
+    await page.click('#nodesRight .node-detail-btn');
+    // Wait for full-screen view to appear
+    await page.waitForSelector('.node-fullscreen', { timeout: 5000 });
+    const isFullScreen = await page.evaluate(() => !!document.querySelector('.node-fullscreen'));
+    assert(isFullScreen, 'Details button should open full-screen node view');
+  });
+
   await browser.close();
 
   // Summary