fix(imaging): support .hab assets, cache avatars/badges, harden routes

The hotel moved from .nitro to .hab bundles, so the imager must treat .hab
like .nitro and the public avatar endpoints must accept the figure strings
the client sends (including extra trailing segments such as `.0`, which the
old FIGURE_RE rejected with a 400).

- imager-upstream: relax FIGURE_RE, extend parseAvatarQuery test coverage
- api/imaging/avatar + /imaging: shared validation, placeholder and ETag/304
- api/imaging/badge: single-flight upstream fetch and conditional responses
- imager-http/imager-png: strong ETag helpers and APNG passthrough guard
- csp + next/image: unoptimized external images, tightened CSP
- deps: override postcss-selector-parser to ^7.1.6
- also fold in the pending drizzle draft snapshot and stray test cleanup

src/lib/imager-upstream.test.ts

@@ -15,7 +15,11 @@ vi.mock("@/lib/runtime-asset-config", () => ({
 	resolveImagerBase: (origin: string) => `${origin}/imager`,
 }));
 
-import { fetchAvatarImage, ImagerUnavailableError } from "./imager-upstream";
+import {
+	fetchAvatarImage,
+	ImagerUnavailableError,
+	parseAvatarQuery,
+} from "./imager-upstream";
 
 const params = new URLSearchParams({ figure: "hr-1", direction: "2" });
 
@@ -136,3 +140,19 @@ it("does not queue a new caller behind a render that is already too old", async
 	expect([...shared[0].body]).toEqual([9]);
 	expect(shared[1].body).toBe(shared[0].body);
 });
+
+it("accepts figures the renderer understands even with a trailing segment", () => {
+	// The client appends extra segments the imager still draws (e.g. the
+	// trailing `.0` here). Rejecting them turned valid avatars into 400s.
+	const figure =
+		"hr-11782-40-40.hd-180-7-14.ch-11592-66.lg-10726-79-1408.sh-11764-1408.ha-11958-70-1408.wa-2007-0.0";
+	const parsed = parseAvatarQuery(new URLSearchParams({ figure }));
+	expect(parsed.ok).toBe(true);
+	if (parsed.ok) expect(parsed.params.get("figure")).toBe(figure);
+});
+
+it("still rejects a figure that is not a figure", () => {
+	for (const figure of ["../bad", "hd-180-1/../x", "", "0"]) {
+		expect(parseAvatarQuery(new URLSearchParams({ figure })).ok).toBe(false);
+	}
+});