Add release to the footer

vite.config.ts

@@ -1,6 +1,33 @@
 import tailwindcss from "@tailwindcss/vite";
 import { sveltekit } from "@sveltejs/kit/vite";
 import { defineConfig, loadEnv } from "vite";
+import { execSync } from "node:child_process";
+import { readFileSync } from "node:fs";
+
+function git(cmd: string): string {
+  try {
+    return execSync(`git ${cmd}`, { stdio: ["ignore", "pipe", "ignore"] })
+      .toString()
+      .trim();
+  } catch {
+    return "";
+  }
+}
+
+// Version comes from package.json; a build that is not exactly the tagged
+// release commit (or has local changes) carries the commit as build metadata,
+// e.g. 0.3.0+a1b2c3d or 0.3.0+a1b2c3d.dirty, so bug reports tell them apart.
+function version(): { version: string; commit: string } {
+  const pkg = JSON.parse(readFileSync("package.json", "utf8"));
+  const commit = git("rev-parse --short HEAD");
+  const tagged = git("tag --points-at HEAD")
+    .split("\n")
+    .includes(`v${pkg.version}`);
+  const dirty = git("status --porcelain --untracked-files=no") !== "";
+  let v = pkg.version;
+  if (commit && (!tagged || dirty)) v += `+${commit}${dirty ? ".dirty" : ""}`;
+  return { version: v, commit };
+}
 
 // PUBLIC_SSR is a build-time decision (it also picks the adapter in
 // svelte.config.js), so it is compiled in as a constant rather than read from
@@ -8,8 +35,13 @@ import { defineConfig, loadEnv } from "vite";
 export default defineConfig(({ mode }) => {
   const env = loadEnv(mode, process.cwd(), "PUBLIC_");
   const ssr = (process.env.PUBLIC_SSR ?? env.PUBLIC_SSR) === "yes";
+  const build = version();
   return {
     plugins: [tailwindcss(), sveltekit()],
-    define: { __SQUALK_SSR__: JSON.stringify(ssr) },
+    define: {
+      __SQUALK_SSR__: JSON.stringify(ssr),
+      __SQUALK_VERSION__: JSON.stringify(build.version),
+      __SQUALK_COMMIT__: JSON.stringify(build.commit),
+    },
   };
 });