style: serve Lora locally, lighten bg, bump article font size

- Install @fontsource/lora and serve latin/latin-ext woff2 files
  (weights 400/700, normal + italic) via Eleventy passthrough copy
- Lora now leads the serif font stack in Tailwind and critical CSS,
  with Iowan Old Style / Palatino as system-font fallbacks
- Light-mode background lightened: #fbf1c7 → #fefcf0 (still warm,
  noticeably less yellow)
- Article prose bumped: post.njk prose-lg, page.njk prose-xl

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package-lock.json

@@ -18,6 +18,7 @@
         "@atproto/api": "^0.12.0",
         "@chrisburnell/eleventy-cache-webmentions": "^2.2.7",
         "@fontsource/inter": "^5.2.8",
+        "@fontsource/lora": "^5.2.8",
         "@kevingimbel/eleventy-plugin-mermaid": "^3.0.1",
         "@quasibit/eleventy-plugin-sitemap": "^2.2.0",
         "@resvg/resvg-js": "^2.6.2",
@@ -550,6 +551,15 @@
         "url": "https://github.com/sponsors/ayuhito"
       }
     },
+    "node_modules/@fontsource/lora": {
+      "version": "5.2.8",
+      "resolved": "https://registry.npmjs.org/@fontsource/lora/-/lora-5.2.8.tgz",
+      "integrity": "sha512-AQlfsHw4TP1x/eb2IZ6VjQ70ctKa39m9JN9A4zlvDOeKYLrCs+GaYIEQ86Y6YfSPGHn01bErXkRcyktOW0LOPQ==",
+      "license": "OFL-1.1",
+      "funding": {
+        "url": "https://github.com/sponsors/ayuhito"
+      }
+    },
     "node_modules/@iarna/toml": {
       "version": "2.2.5",
       "resolved": "https://registry.npmjs.org/@iarna/toml/-/toml-2.2.5.tgz",