Aero goes underwater with rising bubbles; floating cookie notice; Czech title

Frutiger Aero, closer to the mock:
- The scene is water now: sun shafts through a bright surface, caustic
  patches, reeds on the left, a city silhouette on the right, and ten soap
  bubbles that actually rise (own keyframes, varied sizes/speeds/sway; the
  spans are display:none outside aero so they cost nothing elsewhere, and
  they sit still under reduced motion).
- Pale blue glass at 0.8: still reads as glass, but dark navy text clears
  4.5:1 over the water. The phone tab bar mixes the sheet glass instead of
  the page — in aero the page *is* the water, which left its labels at 3.9:1.
- The aero page-level text (muted/subtle) is much darker for the same reason.
- The PWA status bar follows the new water blue (#2fa7e6).

The cookie notice is floating glass now (blurred backdrop, rim, shadow): as a
plain card it read as part of the page background instead of a notice.

Czech: "Tvoje mraznička" -> "Tvůj mrazák" (library title), test updated.

Contrast: 0 below-minimum findings and 0 axe violations across every screen,
all three themes. Version 0.2.1, SW -> freezmo-v55.

tests/mobile-test.mjs

@@ -237,11 +237,17 @@ const AXE = axeSource();
   }));
   check("aero: applied without the dark class", state.aero && !state.dark, JSON.stringify(state));
   check(
-    "aero: the scene becomes a sky",
+    "aero: the scene becomes water",
     state.sky.length > 0 && state.sky !== "#f4f9ff" && state.sky !== "#070b16",
     state.sky,
   );
-  check("aero: the status bar follows the sky", state.themeColor === "#3fa3e0", String(state.themeColor));
+  check(
+    "aero: bubbles rise",
+    (await page.locator(".ice-bubble").count()) === 10 &&
+      (await page.locator(".ice-bubble").first().evaluate((el) => getComputedStyle(el).animationName)) ===
+        "aero-bubble-rise",
+  );
+  check("aero: the status bar follows the water", state.themeColor === "#2fa7e6", String(state.themeColor));
   check(
     "aero: the light/dark toggle is gone",
     (await page.getByRole("button", { name: /Switch to (light|dark) mode/ }).count()) === 0,