diff --git a/astro.config.mjs b/astro.config.mjs
index 6922b3be41..9f66fecf2b 100644
--- a/astro.config.mjs
+++ b/astro.config.mjs
@@ -16,9 +16,13 @@ const skipImageOptimization = process.env.SKIP_IMAGE_OPTIMIZATION === "true";
 // https://astro.build/config
 export default defineConfig({
   output: isSSR ? "server" : "static",
-  adapter: isSSR
-    ? (await import("@astrojs/node")).default({ mode: "standalone" })
-    : undefined,
+  ...(isSSR
+    ? {
+        adapter: (await import("@astrojs/node")).default({
+          mode: "standalone",
+        }),
+      }
+    : {}),
   site: `https://${SITE_ROOTDOMAIN}`,
   trailingSlash: "always",
   markdown: {
diff --git a/src/components/pages/blog/BlogCard.astro b/src/components/pages/blog/BlogCard.astro
index d9e3841255..e589672e48 100644
--- a/src/components/pages/blog/BlogCard.astro
+++ b/src/components/pages/blog/BlogCard.astro
@@ -12,7 +12,7 @@ interface Props {
   tags: string[];
   title: string;
   summary: string;
-  image?: ImageMetadata;
+  image?: ImageMetadata | undefined;
 }
 
 const { author, tags, title, summary, image, id } = Astro.props;
diff --git a/src/components/pages/blog/BlogHeader.astro b/src/components/pages/blog/BlogHeader.astro
index d35ed45851..6e34503a9f 100644
--- a/src/components/pages/blog/BlogHeader.astro
+++ b/src/components/pages/blog/BlogHeader.astro
@@ -7,7 +7,7 @@ interface Props {
   title: string;
   id: string;
   author: string;
-  tags?: string[];
+  tags?: string[] | undefined;
 }
 
 const { title, id, author, tags = [] } = Astro.props;
diff --git a/src/components/pages/community/sponsorships/SponsorCard.astro b/src/components/pages/community/sponsorships/SponsorCard.astro
index a41e481f9a..a5b902086d 100644
--- a/src/components/pages/community/sponsorships/SponsorCard.astro
+++ b/src/components/pages/community/sponsorships/SponsorCard.astro
@@ -6,9 +6,9 @@ import type { ImageMetadata } from "astro";
 interface Props {
   name: string;
   description: string;
-  href?: string;
-  logo?: ImageMetadata;
-  monochrome?: boolean;
+  href?: string | undefined;
+  logo?: ImageMetadata | undefined;
+  monochrome?: boolean | undefined;
 }
 
 const { name, description, href, logo, monochrome = false } = Astro.props;
diff --git a/src/components/pages/downloads/CommunityCard.astro b/src/components/pages/downloads/CommunityCard.astro
index c6e0fa157d..aab8ac4455 100644
--- a/src/components/pages/downloads/CommunityCard.astro
+++ b/src/components/pages/downloads/CommunityCard.astro
@@ -20,7 +20,7 @@ interface Props {
   link: string;
   linkText?: string;
   translateTag?: (key: string) => string;
-  id?: string;
+  id?: string | undefined;
 }
 
 const {
@@ -42,7 +42,9 @@ const ALIAS: Record<string, string> = {
   osx: "macos",
 };
 
-const ICONS: Record<string, ImageMetadata> = {
+type PlatformKey = "windows" | "macos" | "linux" | "android" | "ios";
+
+const ICONS: Record<PlatformKey, ImageMetadata> = {
   windows: icons.mask("brand/windows"),
   macos: icons.mask("brand/apple"),
   linux: icons.mask("brand/linux"),
@@ -58,17 +60,23 @@ const LABEL: Record<string, string> = {
   ios: t("downloads:platforms.ios") || "iOS",
 };
 
+const isPlatformKey = (key: string): key is PlatformKey => key in ICONS;
+
 const VALID = {
   desktop: new Set(["windows", "macos", "linux"]),
   mobile: new Set(["android", "ios"]),
 };
 
-function normalizeKeys(arr: string[] | undefined, set: Set<string>) {
+function normalizeKeys(
+  arr: string[] | undefined,
+  set: Set<string>,
+): PlatformKey[] {
   return Array.from(
     new Set( // remove duplicates post-normalization
       (arr ?? [])
         .map((s) => ALIAS[norm(s)] ?? norm(s))
-        .filter((k) => set.has(k)),
+        .filter((k) => set.has(k))
+        .filter(isPlatformKey),
     ),
   );
 }
diff --git a/src/components/pages/downloads/CoreCard.astro b/src/components/pages/downloads/CoreCard.astro
index 9880f7d736..3563cf5356 100644
--- a/src/components/pages/downloads/CoreCard.astro
+++ b/src/components/pages/downloads/CoreCard.astro
@@ -53,7 +53,7 @@ const {
 } = Astro.props;
 const { t, safeMarkdown } = Astro.locals;
 
-const PLATFORM_ICONS: Record<string, ImageMetadata> = {
+const PLATFORM_ICONS: Record<DownloadLink["platform"], ImageMetadata> = {
   windows: icons.mask("brand/windows"),
   macos: icons.mask("brand/apple"),
   linux: icons.mask("brand/linux"),
diff --git a/src/components/pages/resources/research-lab/PaperCard.astro b/src/components/pages/resources/research-lab/PaperCard.astro
index 5262b2d084..de8c55876c 100644
--- a/src/components/pages/resources/research-lab/PaperCard.astro
+++ b/src/components/pages/resources/research-lab/PaperCard.astro
@@ -3,11 +3,11 @@ import Card from "@/components/ui/Card.astro";
 import IconLink from "@/components/ui/IconLink.astro";
 
 interface Props {
-  code?: string;
+  code?: string | undefined;
   title: string;
   abstract: string;
   url: string;
-  note?: string;
+  note?: string | undefined;
 }
 
 const { code, title, abstract, url, note } = Astro.props;
diff --git a/src/components/ui/Button.astro b/src/components/ui/Button.astro
index bfc9a38009..ee18c3592d 100644
--- a/src/components/ui/Button.astro
+++ b/src/components/ui/Button.astro
@@ -7,7 +7,7 @@ type Variant = "primary" | "secondary" | "outline" | "danger";
 interface Props extends HTMLAttributes<As> {
   variant?: Variant;
   class?: string;
-  href?: string;
+  href?: string | undefined;
   target?: string;
   rel?: string;
   as?: As;
diff --git a/src/components/ui/ExternalResourceButton.astro b/src/components/ui/ExternalResourceButton.astro
index bc15ba1253..bb9a7beab0 100644
--- a/src/components/ui/ExternalResourceButton.astro
+++ b/src/components/ui/ExternalResourceButton.astro
@@ -9,9 +9,9 @@ import { icons } from "@/utils/icons";
 export interface Props extends HTMLAttributes<"div"> {
   href: string;
   title: string;
-  subtitle?: string;
-  logo?: ImageMetadata;
-  onionHref?: string;
+  subtitle?: string | undefined;
+  logo?: ImageMetadata | undefined;
+  onionHref?: string | undefined;
   variant?: "default" | "mini";
   border?: boolean;
 }
diff --git a/src/components/ui/Paginator.astro b/src/components/ui/Paginator.astro
index 54f33c6e4b..6c7f1de1ab 100644
--- a/src/components/ui/Paginator.astro
+++ b/src/components/ui/Paginator.astro
@@ -34,12 +34,11 @@ if (last <= 5) {
   );
   const sorted = [...visible].sort((a, b) => a - b);
 
-  for (let i = 0; i < sorted.length; i++) {
-    const n = sorted[i];
-    const prev = sorted[i - 1];
+  for (const [i, n] of sorted.entries()) {
+    const prev = i > 0 ? sorted[i - 1] : undefined;
 
     // Add ellipsis or fill single gap
-    if (i > 0) {
+    if (prev !== undefined) {
       const gap = n - prev;
       if (gap === 2) {
         items.push({ type: "page", number: prev + 1 });
diff --git a/src/components/ui/accordion/AccordionItem.astro b/src/components/ui/accordion/AccordionItem.astro
index d7190fa954..1e46392acb 100644
--- a/src/components/ui/accordion/AccordionItem.astro
+++ b/src/components/ui/accordion/AccordionItem.astro
@@ -7,7 +7,7 @@ export interface Props {
   title: string;
   content?: string;
   variant?: "default" | "card";
-  name?: string;
+  name?: string | undefined;
   open?: boolean;
 }
 
diff --git a/src/components/ui/dropdown/Dropdown.astro b/src/components/ui/dropdown/Dropdown.astro
index f3da43387b..5978b468ee 100644
--- a/src/components/ui/dropdown/Dropdown.astro
+++ b/src/components/ui/dropdown/Dropdown.astro
@@ -5,7 +5,7 @@ import { icons } from "@/utils/icons";
 
 interface Props {
   label?: string;
-  name?: string;
+  name?: string | undefined;
 }
 const { label, name } = Astro.props;
 ---
diff --git a/src/components/ui/header/NavItem.astro b/src/components/ui/header/NavItem.astro
index 08dca812cb..2e08162cda 100644
--- a/src/components/ui/header/NavItem.astro
+++ b/src/components/ui/header/NavItem.astro
@@ -11,7 +11,7 @@ export interface DropdownItem {
   href: string;
   desc?: string;
   icon: ImageMetadata;
-  iconDark?: ImageMetadata;
+  iconDark: ImageMetadata;
 }
 
 export interface Props {
diff --git a/src/components/ui/icons/MaskIcon.astro b/src/components/ui/icons/MaskIcon.astro
index 05bd7f8838..9f2031c78b 100644
--- a/src/components/ui/icons/MaskIcon.astro
+++ b/src/components/ui/icons/MaskIcon.astro
@@ -6,7 +6,7 @@ export interface Props {
   src: ImageMetadata;
   size?: number | string;
   rtl?: boolean;
-  color?: string;
+  color?: string | undefined;
   spacing?: string;
 }
 
diff --git a/src/data/navigation.ts b/src/data/navigation.ts
index 7b9c58acf4..9ec023dd3a 100644
--- a/src/data/navigation.ts
+++ b/src/data/navigation.ts
@@ -5,7 +5,7 @@ interface DropdownItem {
   key: string;
   href: string;
   icon: ImageMetadata;
-  iconDark?: ImageMetadata;
+  iconDark: ImageMetadata;
 }
 
 interface NavDropdownConfig {
diff --git a/src/layouts/Layout.astro b/src/layouts/Layout.astro
index f54c1be144..edb4863d38 100644
--- a/src/layouts/Layout.astro
+++ b/src/layouts/Layout.astro
@@ -63,14 +63,8 @@ const fullTitle = title.includes("|")
           ),
           siteName: "Monero",
         },
-        image: {
-          alt: openGraph?.image?.alt ?? undefined,
-        },
-        article: {
-          publishedTime: openGraph?.article?.publishedTime ?? undefined,
-          authors: openGraph?.article?.authors ?? undefined,
-          tags: openGraph?.article?.tags ?? undefined,
-        },
+        image: openGraph?.image ?? {},
+        article: openGraph?.article ?? {},
       }}
       languageAlternates={Object.keys(locales).map((lang) => ({
         hrefLang: lang,
diff --git a/src/pages/resources/press-kit.astro b/src/pages/resources/press-kit.astro
index 5e6f0a6dc9..30c4c6a8b4 100644
--- a/src/pages/resources/press-kit.astro
+++ b/src/pages/resources/press-kit.astro
@@ -23,8 +23,11 @@ import { getPublicImageDimensions } from "@/utils/image";
 import { icons } from "@/utils/icons";
 
 const { t, localizeHref } = Astro.locals;
-const previewDimensions = await Promise.all(
-  brandAssets.map((asset) => getPublicImageDimensions(asset.preview)),
+const brandAssetPreviews = await Promise.all(
+  brandAssets.map(async (asset) => ({
+    asset,
+    preview: await getPublicImageDimensions(asset.preview),
+  })),
 );
 
 const sections = [
@@ -68,11 +71,11 @@ const sections = [
     >
       <Grid minWidth="22rem" gap="xl" class="assets-grid">
         {
-          brandAssets.map((asset, i) => (
+          brandAssetPreviews.map(({ asset, preview }) => (
             <BrandAssetCard
               asset={asset}
-              previewWidth={previewDimensions[i].width}
-              previewHeight={previewDimensions[i].height}
+              previewWidth={preview.width}
+              previewHeight={preview.height}
             />
           ))
         }
diff --git a/src/plugins/remark-moneropedia/index.ts b/src/plugins/remark-moneropedia/index.ts
index bc3f9fe5d8..13f74f1243 100644
--- a/src/plugins/remark-moneropedia/index.ts
+++ b/src/plugins/remark-moneropedia/index.ts
@@ -83,7 +83,7 @@ export const moneropediaLinks: Plugin<[], Root> = () => {
       );
     } catch (error) {
       console.error("[moneropedia] Processing error:", error);
-      return tree;
+      return;
     }
   };
 };
diff --git a/src/utils/blog.ts b/src/utils/blog.ts
index ce12dd8ef8..0d4228a0fc 100644
--- a/src/utils/blog.ts
+++ b/src/utils/blog.ts
@@ -2,6 +2,12 @@ export const idToDateSlug = (id: string): string => {
   const [year, month, day, ...rest] = id.split("-");
   const title = rest.join("-");
 
+  if (!year || !month || !day) {
+    throw new Error(
+      `Blog id "${id}" is not in the expected YYYY-MM-DD-title form.`,
+    );
+  }
+
   return `${year}/${month.padStart(2, "0")}/${day.padStart(2, "0")}/${title}`;
 };
 
diff --git a/src/utils/icons.ts b/src/utils/icons.ts
index 7cb1e70b46..33af927fb8 100644
--- a/src/utils/icons.ts
+++ b/src/utils/icons.ts
@@ -39,7 +39,7 @@ export const icons = {
     return m;
   },
 
-  color(name: string): { light: ImageMetadata; dark?: ImageMetadata } {
+  color(name: string): { light: ImageMetadata; dark: ImageMetadata } {
     const light = lightIcons[name] ?? colorRoot[name];
     if (!light) throw new Error(`Unknown color icon: "${name}"`);
     return { light, dark: darkIcons[name] ?? light };
diff --git a/tsconfig.json b/tsconfig.json
index 96521c2696..7f90d5fcbd 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,5 +1,5 @@
 {
-  "extends": "astro/tsconfigs/strict",
+  "extends": "astro/tsconfigs/strictest",
   "include": [".astro/types.d.ts", "**/*"],
   "exclude": ["dist"],
   "compilerOptions": {