App versioning + the create page's missing top padding

Versioning: package.json carries the app version (0.1.2 here; one bump per
task with `npm run version:bump`, patch 0-9 rolling into the minor at 10),
baked into the build via lib/version.ts, reported by /api/healthz and shown
in Settings next to the running commit. AGENTS.md documents the rule; the
native suite checks both the API and the Settings row.

Fix: on desktop the app header is hidden, so every page owns its top padding —
/create was the only one without `lg:pt-10`, which slammed the Study deck /
Make my homework switch against the top of the window while /homework had a
comfortable gap. Both now sit at 40px; the wizard suite asserts the clearance
and that the two pages stay in step (90 checks).

SW -> freezmo-v50.

scripts/bump-version.mjs

@@ -0,0 +1,41 @@
+#!/usr/bin/env node
+/**
+ * Bump the app version one step: 0.1.7 -> 0.1.8, and 0.1.9 -> 0.2.0 — the
+ * patch digit never reaches two digits (the working rule is one bump per
+ * task; see AGENTS.md).
+ *
+ *   npm run version:bump            # one step up, prints old -> new
+ *   npm run version:bump -- 0.3.0   # set an explicit version
+ *
+ * The version is baked into the build (lib/version.ts) and shown in Settings
+ * next to the running commit.
+ */
+import { readFileSync, writeFileSync } from "node:fs";
+import path from "node:path";
+
+const file = path.join(import.meta.dirname, "..", "package.json");
+const raw = readFileSync(file, "utf8");
+const current = JSON.parse(raw).version;
+
+const explicit = process.argv[2];
+let next = explicit;
+
+if (!next) {
+  const match = /^(\d+)\.(\d+)\.(\d+)$/.exec(current);
+  if (!match) {
+    console.error(`package.json version "${current}" is not x.y.z — pass one explicitly`);
+    process.exit(1);
+  }
+  const major = Number(match[1]);
+  const minor = Number(match[2]);
+  const patch = Number(match[3]);
+  next = patch >= 9 ? `${major}.${minor + 1}.0` : `${major}.${minor}.${patch + 1}`;
+}
+
+if (!/^\d+\.\d+\.\d+$/.test(next)) {
+  console.error(`"${next}" is not a valid x.y.z version`);
+  process.exit(1);
+}
+
+writeFileSync(file, raw.replace(`"version": "${current}"`, `"version": "${next}"`));
+console.log(`${current} -> ${next}`);