Hotfix: planner init crashed for admin accounts, killing autosave and the plans list

The admin nav-link reveal ran before the generated nav existed
(getElementById('nav-admin') was null only for admins — which is why
tests and non-admin checks missed it), aborting init before form wiring,
autosave, and loadPlans. initSideNav now runs first, the reveal is
null-safe, and wireCuppingLink degrades instead of crashing (its button
lost its home when After-the-Roast moved — it now lives at the end of
the Roast Log section with a pointer to the Roasts page).

Also: the Roasts page graph now honors the planner's °C/°F preference.

Co-Authored-By: Claude Fable 5 <[email protected]>

public/js/main.js

@@ -1121,6 +1121,9 @@ function wireSectionNav() {
 }
 
 async function init() {
+	// The side nav is generated — render it before anything touches its elements (the admin
+	// link reveal below crashed init for admin accounts when this ran later).
+	initSideNav();
 	try {
 		const meResponse = await fetch("/api/auth/me");
 		if (!meResponse.ok) {
@@ -1132,7 +1135,7 @@ async function init() {
 		document.getElementById("settings-email").textContent = user.email;
 		applyAvatar(document.getElementById("nav-user-avatar"), user);
 		if (user.role === "admin")
-			document.getElementById("nav-admin").classList.remove("hidden");
+			document.getElementById("nav-admin")?.classList.remove("hidden");
 		const localDraft = loadFromStorage(user.id);
 		state.plan = localDraft ?? blankPlan();
 		const draftRemoteId = remotePlanId;
@@ -1187,7 +1190,6 @@ async function init() {
 	renderBandRanges();
 	renderFormFromPlan();
 	wireForm();
-	initSideNav();
 	wireDrawers();
 	wireToolbar();
 	wireToolsMenu();
@@ -1225,6 +1227,9 @@ async function init() {
 function wireCuppingLink() {
 	const button = document.getElementById("btn-open-cupping");
 	const note = document.getElementById("cupping-link-note");
+	// Defensive: this UI lives in the Roast Log section; a missing element must degrade to
+	// "no cupping shortcut", never crash init (that failure mode silently killed autosave).
+	if (!button || !note) return;
 	button.addEventListener("click", async () => {
 		button.disabled = true;
 		try {