chore: fix lint — upgrade prettier plugins, format, resolve eslint errors

`npm run lint` was broken and noisy:

- prettier-plugin-svelte 3.5.2 / prettier-plugin-tailwindcss 0.6.14 crashed
  on prettier 3.8 with "getVisitorKeys is not a function". Bumped to ^4.1.1
  and ^0.8.0 (compatible with the new embed API).
- Added .prettierignore (build output, .svelte-kit, generated drizzle
  migration meta, lockfile/data) and ran prettier --write across the repo.
- Typed layout `children` as Snippet (was `any`).
- Added keys to the EXTRACTORS {#each} blocks in settings.
- Disabled svelte/no-navigation-without-resolve: the app serves from the
  domain root (no base path) and links to external URLs + raw API endpoints,
  where resolve() is unnecessary or wrong.

No runtime behaviour change.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

package-lock.json

@@ -36,8 +36,8 @@
 				"jsdom": "^26.0.0",
 				"playwright": "^1.60.0",
 				"prettier": "^3.4.2",
-				"prettier-plugin-svelte": "^3.3.3",
-				"prettier-plugin-tailwindcss": "^0.6.11",
+				"prettier-plugin-svelte": "^4.1.1",
+				"prettier-plugin-tailwindcss": "^0.8.0",
 				"svelte": "^5.0.0",
 				"svelte-check": "^4.0.0",
 				"tailwindcss": "^4.0.0",
@@ -5640,24 +5640,27 @@
 			}
 		},
 		"node_modules/prettier-plugin-svelte": {
-			"version": "3.5.2",
-			"resolved": "https://registry.npmjs.org/prettier-plugin-svelte/-/prettier-plugin-svelte-3.5.2.tgz",
-			"integrity": "sha512-ItFouLvzSFE3ulNl4DKoWM3BGcbDCNVpIyy/Y3F2gC3aNiGLxtFUdffVqO5Z5hhYG+DFT5KULWaxmeFFpdbvaQ==",
-			"dev": true,
-			"license": "MIT",
-			"peerDependencies": {
-				"prettier": "^3.0.0",
-				"svelte": "^3.2.0 || ^4.0.0-next.0 || ^5.0.0-next.0"
-			}
-		},
-		"node_modules/prettier-plugin-tailwindcss": {
-			"version": "0.6.14",
-			"resolved": "https://registry.npmjs.org/prettier-plugin-tailwindcss/-/prettier-plugin-tailwindcss-0.6.14.tgz",
-			"integrity": "sha512-pi2e/+ZygeIqntN+vC573BcW5Cve8zUB0SSAGxqpB4f96boZF4M3phPVoOFCeypwkpRYdi7+jQ5YJJUwrkGUAg==",
+			"version": "4.1.1",
+			"resolved": "https://registry.npmjs.org/prettier-plugin-svelte/-/prettier-plugin-svelte-4.1.1.tgz",
+			"integrity": "sha512-wXvbXMjSvb4C9ENWTHXyd+ihakKCsJ6rJhLP6/8HFNj4GkZr48jqL9PoKsl2sk7SyCZRTnJ7O2TTowUpOxP/KA==",
 			"dev": true,
 			"license": "MIT",
 			"engines": {
-				"node": ">=14.21.3"
+				"node": ">=20"
+			},
+			"peerDependencies": {
+				"prettier": "^3.0.0",
+				"svelte": "^5.0.0"
+			}
+		},
+		"node_modules/prettier-plugin-tailwindcss": {
+			"version": "0.8.0",
+			"resolved": "https://registry.npmjs.org/prettier-plugin-tailwindcss/-/prettier-plugin-tailwindcss-0.8.0.tgz",
+			"integrity": "sha512-V8ITGH87yuBDF6JpEZTOVlUz/saAwqb8f3HRgUj8Lh+tGCcrmorhsLpYqzygwFwK0PE2Ib6Mv3M7T/uE2tZV1g==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=20.19"
 			},
 			"peerDependencies": {
 				"@ianvs/prettier-plugin-sort-imports": "*",
@@ -5670,14 +5673,12 @@
 				"prettier": "^3.0",
 				"prettier-plugin-astro": "*",
 				"prettier-plugin-css-order": "*",
-				"prettier-plugin-import-sort": "*",
 				"prettier-plugin-jsdoc": "*",
 				"prettier-plugin-marko": "*",
 				"prettier-plugin-multiline-arrays": "*",
 				"prettier-plugin-organize-attributes": "*",
 				"prettier-plugin-organize-imports": "*",
 				"prettier-plugin-sort-imports": "*",
-				"prettier-plugin-style-order": "*",
 				"prettier-plugin-svelte": "*"
 			},
 			"peerDependenciesMeta": {
@@ -5708,9 +5709,6 @@
 				"prettier-plugin-css-order": {
 					"optional": true
 				},
-				"prettier-plugin-import-sort": {
-					"optional": true
-				},
 				"prettier-plugin-jsdoc": {
 					"optional": true
 				},
@@ -5729,9 +5727,6 @@
 				"prettier-plugin-sort-imports": {
 					"optional": true
 				},
-				"prettier-plugin-style-order": {
-					"optional": true
-				},
 				"prettier-plugin-svelte": {
 					"optional": true
 				}