Add logo, manifest and types files.

source/assets/re-nav.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="128" height="128" viewBox="0 0 100 100">
+  <rect fill="#E6DEFF" width="100" height="100" />
+
+  <text
+    fill="#1F1731"
+    font-family="Inter"
+    font-size="75"
+    font-weight="900"
+    x="51"
+    y="75"
+    alignment-baseline="middle"
+    text-anchor="middle"
+  >
+    ↩
+  </text>
+</svg>

source/manifest.ts

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+/* eslint-disable @typescript-eslint/naming-convention */
+
+export default function createManifest(
+  target: string,
+): Record<string, unknown> {
+  const manifest: Record<string, unknown> = {
+    name: 're-nav',
+    description: 'Navigation redirects for the masses.',
+    version: '0.1.0',
+    permissions: ['storage', 'webNavigation'],
+    options_ui: {
+      page: 'options/index.html',
+      open_in_tab: true,
+    },
+  };
+
+  const icons = {
+    128: 'assets/re-nav.png',
+  };
+
+  manifest.icons = icons;
+
+  const browserAction = {
+    default_icon: icons,
+  };
+
+  const backgroundScript = 'background-scripts/initialize.ts';
+
+  if (target === 'chromium') {
+    manifest.manifest_version = 3;
+    manifest.action = browserAction;
+    manifest.background = {
+      service_worker: backgroundScript,
+      type: 'module',
+    };
+  } else {
+    manifest.manifest_version = 2;
+    manifest.browser_action = browserAction;
+    manifest.background = {
+      scripts: [backgroundScript],
+    };
+  }
+
+  return manifest;
+}

source/types.d.ts

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+import {html} from 'htm/preact';
+
+declare global {
+  // See Vite documentation for `import.meta.env` usage.
+  // https://vitejs.dev/guide/env-and-mode.html
+
+  interface ImportMeta {
+    readonly env: ImportMetaEnv;
+  }
+
+  interface ImportMetaEnv {
+    readonly BASE_URL: string;
+    readonly DEV: boolean;
+    readonly MODE: string;
+    readonly PROD: boolean;
+    readonly VITE_BROWSER: 'chromium' | 'firefox';
+  }
+
+  type HtmComponent = ReturnType<typeof html>;
+}