chore(ci): drop visual regression suite

Visual snapshots were generated on macOS but CI runs on Linux, and
font hinting differences between the two would always produce false
positives. The job was already continue-on-error and the baselines
weren't giving trustworthy signal — remove the spec, baselines, CI
job, and now-unneeded snapshot config / --ignore-snapshots flag.
Functional e2e coverage in the playwright job is unaffected.

playwright.config.js

@@ -6,8 +6,6 @@ const BASE_URL = `http://localhost:${PORT}`;
 export default defineConfig({
   testDir: "./e2e",
   outputDir: "e2e/test-results",
-  snapshotDir: "e2e/__screenshots__",
-  snapshotPathTemplate: "{snapshotDir}/{testFileDir}/{testFileName}-snapshots/{arg}-{projectName}{ext}",
   fullyParallel: false,
   forbidOnly: !!process.env.CI,
   retries: process.env.CI ? 1 : 1,