Pin the page clock to an Austin afternoon in the Navara bloom and style checks

The look's sun follows the page clock, so the frame these checks compare was as bright as the hour they ran at: in the acceptance run the half-strength bloom changed the frame by 0.29 against 3.5 earlier, and at dusk the full bloom changes nothing (luma 13).

scripts/qa-navara-bloom.mjs

@@ -21,6 +21,7 @@ import {
   diff,
   freeze,
   pickStyle,
+  pinDaytime,
   saveCapture,
   stats,
   visualPageUrl,
@@ -58,6 +59,9 @@ await strict.run(
     const page = await browser.newPage();
     const errors = [];
     page.on('pageerror', (error) => errors.push(error.message));
+    // The same sun on every run: the frame's brightness decides what blooms
+    // and what each style's signature reads.
+    await pinDaytime(page);
     await page.evaluateOnNewDocument(() => {
       localStorage.setItem('gev:first-run-mission:v1', 'suppressed');
     });