fix(plugin): inject sidebar buttons into BOTH .rail (desktop) + .sidebar-nav (mobile)

ROOT CAUSE of JP's "buttons not showing" report: hermes-webui has two nav
containers — `<nav class="rail">` (desktop ≥641px, rail-btn 20×20 stroke
1.5) and `.sidebar-nav` (mobile, nav-tab 18×18 stroke 2). My previous
injection only touched .sidebar-nav, so on desktop the buttons literally
didn't exist anywhere visible.

This patch:
- Defines per-container button templates (class list + svg size/stroke)
  matching exactly how upstream renders its native rail-btn vs nav-tab
- Iterates both containers on init + retries
- MutationObserver re-injects into either if something re-renders it
- Tooltip modifier (--bottom) only applied for sidebar-nav (mobile pattern)
- SVG paths centralized so adding new tabs is one entry

Karpathy 4 rules: surfaced root cause via console logs + DOM inspection
instead of guessing, simplest fix (data-driven container list), surgical
(no other behavior changed).

static/svrnty_nav.js

@@ -15,55 +15,84 @@
   const ERR = (...a) => console.error("[svrnty-nav]", ...a);
   LOG("loaded", { readyState: document.readyState });
 
+  // SVG paths only — sizes/strokes templated per container (rail uses 20×20
+  // stroke 1.5; sidebar-nav uses 18×18 stroke 2). Matches existing buttons.
+  const ICONS = {
+    adwright:
+      '<circle cx="12" cy="12" r="10"/><circle cx="12" cy="12" r="6"/><circle cx="12" cy="12" r="2"/>',
+    bte:
+      '<path d="M12 2l1.8 5.6L19.4 9.4l-4.5 3.3 1.7 5.7L12 15l-4.6 3.4 1.7-5.7L4.6 9.4l5.6-1.8L12 2z"/>',
+  };
   const TABS = [
+    { id: "adwright", label: "Adwright", tooltip: "Adwright — marketing intelligence" },
+    { id: "bte",      label: "BTE",      tooltip: "BTE — brand creative studio" },
+  ];
+
+  function _svg(iconPath, size, stroke) {
+    return (
+      '<svg width="' + size + '" height="' + size + '" viewBox="0 0 24 24" ' +
+      'fill="none" stroke="currentColor" stroke-width="' + stroke + '" ' +
+      'stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">' +
+      iconPath + "</svg>"
+    );
+  }
+
+  // Two containers: .rail (desktop, .rail-btn nav-tab 20×20 stroke-1.5) +
+  // .sidebar-nav (mobile, .nav-tab 18×18 stroke-2). Inject into BOTH if present.
+  const CONTAINERS = [
     {
-      id: "adwright",
-      label: "Adwright",
-      tooltip: "Adwright — marketing intelligence",
-      // Bullseye / target icon — marketing focus
-      svg: '<svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><circle cx="12" cy="12" r="10"/><circle cx="12" cy="12" r="6"/><circle cx="12" cy="12" r="2"/></svg>',
+      selector: ".rail",
+      btnClass: "rail-btn nav-tab has-tooltip svrnty-nav-tab",
+      size: 20,
+      stroke: 1.5,
+      tooltipMod: "",
     },
     {
-      id: "bte",
-      label: "BTE",
-      tooltip: "BTE — brand creative studio",
-      // Palette/sparkle icon — creative
-      svg: '<svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M12 2l1.8 5.6L19.4 9.4l-4.5 3.3 1.7 5.7L12 15l-4.6 3.4 1.7-5.7L4.6 9.4l5.6-1.8L12 2z"/></svg>',
+      selector: ".sidebar-nav",
+      btnClass: "nav-tab has-tooltip has-tooltip--bottom svrnty-nav-tab",
+      size: 18,
+      stroke: 2,
+      tooltipMod: "--bottom",
     },
   ];
 
   function _injectButtons() {
-    const nav = document.querySelector(".sidebar-nav");
-    if (!nav) {
-      LOG("_injectButtons: .sidebar-nav not found yet");
+    let anyContainerFound = false;
+    let totalAdded = 0;
+    CONTAINERS.forEach((c) => {
+      const container = document.querySelector(c.selector);
+      if (!container) return;
+      anyContainerFound = true;
+      TABS.forEach((t) => {
+        if (container.querySelector('[data-panel="' + t.id + '"]')) return;
+        try {
+          const btn = document.createElement("button");
+          btn.className = c.btnClass;
+          btn.setAttribute("data-panel", t.id);
+          btn.setAttribute("data-label", t.label);
+          btn.setAttribute("data-tooltip", t.tooltip);
+          btn.setAttribute("aria-label", t.label);
+          btn.innerHTML = _svg(ICONS[t.id], c.size, c.stroke);
+          btn.addEventListener("click", () => {
+            LOG("clicked:", t.id);
+            if (typeof window.switchPanel === "function") {
+              window.switchPanel(t.id, { fromRailClick: true });
+            } else {
+              ERR("switchPanel undefined — cannot route click");
+            }
+          });
+          container.appendChild(btn);
+          totalAdded++;
+        } catch (e) {
+          ERR("inject failed", c.selector, t.id, e);
+        }
+      });
+    });
+    if (!anyContainerFound) {
+      LOG("_injectButtons: neither .rail nor .sidebar-nav present yet");
       return false;
     }
-    let added = 0;
-    TABS.forEach((t) => {
-      if (nav.querySelector('[data-panel="' + t.id + '"]')) return;
-      try {
-        const btn = document.createElement("button");
-        btn.className = "nav-tab has-tooltip has-tooltip--bottom svrnty-nav-tab";
-        btn.setAttribute("data-panel", t.id);
-        btn.setAttribute("data-label", t.label);
-        btn.setAttribute("data-tooltip", t.tooltip);
-        btn.setAttribute("aria-label", t.label);
-        btn.innerHTML = t.svg;
-        btn.addEventListener("click", () => {
-          LOG("button clicked:", t.id);
-          if (typeof window.switchPanel === "function") {
-            window.switchPanel(t.id, { fromRailClick: true });
-          } else {
-            ERR("switchPanel is not a function — cannot route click");
-          }
-        });
-        nav.appendChild(btn);
-        added++;
-      } catch (e) {
-        ERR("failed to inject button", t.id, e);
-      }
-    });
-    LOG("_injectButtons: added", added, "of", TABS.length, "(nav children:", nav.children.length, ")");
+    LOG("_injectButtons: added", totalAdded, "buttons across containers");
     return true;
   }
 
@@ -119,12 +148,14 @@
     _init();
   }
 
-  // Re-inject buttons if something re-renders the sidebar (defensive).
+  // Re-inject buttons if something re-renders rail or sidebar-nav (defensive).
   const obs = new MutationObserver(() => {
-    const nav = document.querySelector(".sidebar-nav");
-    if (!nav) return;
-    const missing = TABS.some((t) => !nav.querySelector('[data-panel="' + t.id + '"]'));
-    if (missing) _injectButtons();
+    CONTAINERS.forEach((c) => {
+      const container = document.querySelector(c.selector);
+      if (!container) return;
+      const missing = TABS.some((t) => !container.querySelector('[data-panel="' + t.id + '"]'));
+      if (missing) _injectButtons();
+    });
   });
   if (document.body) {
     obs.observe(document.body, { childList: true, subtree: true });