Bump deps (#515)

* chore: add nix flake for reproducible dev environment

Signed-off-by: Sped0n <hi@sped0n.com>

* refactor: migrate SCSS to modern Sass (@use/@forward)

Update mixins to use Sass module functions (map.has-key/get).
Configure Vite for modern Sass API.
Introduce _foundation.scss for forwarding core modules.

Signed-off-by: Sped0n <hi@sped0n.com>

* fix: replace deprecated _build with build in frontmatter

Signed-off-by: Sped0n <hi@sped0n.com>

* chore: add vcache.sh script for vercel build cache management

Signed-off-by: Sped0n <hi@sped0n.com>

* refactor: migrate to ESLint v9 flat config

Remove legacy .eslintrc.json, .eslintignore, and .prettierrc.json.

Add eslint.config.mjs with love, prettier, solid, and import rules.

Update devDependencies (eslint@9, @typescript-eslint@8, etc.) and scripts.

Minor TS fixes: remove eslint-disable, add error logging, simplify conditional.

Signed-off-by: Sped0n <hi@sped0n.com>

* chore: replace vcache.sh with vercel.sh for Vercel build process

Delete vcache.sh script.

Add vercel.sh: install Dart Sass v1.93.3, copy generated assets between
node_modules and project dirs, run vite:build + hugo build, then copy back.

Signed-off-by: Sped0n <hi@sped0n.com>

* chore: setup dart-sass and split build steps in GitHub workflow

Signed-off-by: Sped0n <hi@sped0n.com>

---------

Signed-off-by: Sped0n <hi@sped0n.com>

prettier.config.mjs

@@ -0,0 +1,23 @@
+/**
+ * @see https://prettier.io/docs/configuration
+ * @type {import("prettier").Config}
+ */
+const config = {
+  useTabs: false,
+  tabWidth: 2,
+  printWidth: 88,
+  singleQuote: true,
+  trailingComma: 'none',
+  bracketSpacing: true,
+  semi: false,
+  plugins: ['prettier-plugin-go-template', 'prettier-plugin-organize-imports'],
+  overrides: [
+    {
+      files: ['*.html'],
+      options: {
+        parser: 'go-template'
+      }
+    }
+  ]
+}
+export default config