feat(integrations): surface chromium extension install

Link Chrome and Chromium users to the manual load-unpacked instructions from the README and Settings > Integrations.

Advance the bundled extension submodule to the Chromium package build commit.

README.md

@@ -68,20 +68,23 @@ Production bundles include the required media engines for the target platform. U
 
 <div align="center">
   <a href="https://addons.mozilla.org/en-US/firefox/addon/firelink-companion/"><img src="https://img.shields.io/badge/Install%20Firelink%20Companion-Firefox-FF7139?style=for-the-badge&logo=firefox-browser&logoColor=white" alt="Install Firelink Companion on Firefox" /></a>
+  <a href="https://github.com/nimbold/Firelink-Extension#manual-chromium-installation"><img src="https://img.shields.io/badge/Manual%20Chrome%2FChromium%20Install-Chrome%2FEdge%2FBrave%2FVivaldi%2FOpera-4285F4?style=for-the-badge&logo=googlechrome&logoColor=white" alt="Read manual Chrome and Chromium install instructions" /></a>
 </div>
 
 Firelink Companion connects your browser to the desktop app so links and browser downloads can open in Firelink instead of disappearing into the browser's default download shelf.
+The Chrome extension is currently distributed as a manual Chromium package while Chrome Web Store publication is pending. Follow the [manual Chrome/Chromium installation instructions](https://github.com/nimbold/Firelink-Extension#manual-chromium-installation) and download `firelink-chromium.zip` from the [Firelink-Extension releases](https://github.com/nimbold/Firelink-Extension/releases).
 
 What it adds:
 
 - **Automatic capture** for ordinary browser downloads, while still routing every captured link through Firelink's Add window.
+- **Firefox and Chromium support** for Firefox, Chrome, Edge, Brave, Vivaldi, Opera, and other compatible desktop Chromium browsers.
 - **Context-menu actions** for "Download with Firelink" and selected links.
 - **Signed local requests** using the pairing token from **Settings -> Integrations**.
 - **Server identity checks** so the extension only trusts the real local Firelink app.
 - **Offline-safe behavior** that resumes browser downloads when Firelink is closed or rejects a handoff.
 - **Protocol-aware compatibility** so older desktop builds are rejected before automatic capture can cancel a browser download.
 
-Install the extension, open Firelink, then pair it from **Settings -> Integrations**. The Firefox add-on is maintained in the [Firelink-Extension](https://github.com/nimbold/Firelink-Extension) repository and is also vendored here as the `Extensions/Firefox` submodule.
+Install the extension, open Firelink, then pair it from **Settings -> Integrations**. Firefox users can install from Mozilla Add-ons. Chrome and Chromium users can use the [manual load-unpacked flow](https://github.com/nimbold/Firelink-Extension#manual-chromium-installation). The extension is maintained in the [Firelink-Extension](https://github.com/nimbold/Firelink-Extension) repository and is also vendored here as the `Extensions/Firefox` submodule.
 
 ## Platforms
 

src/components/SettingsView.tsx

@@ -1244,7 +1244,7 @@ className="app-button px-3 py-1.5 text-[12px] flex items-center gap-1.5 disabled
                       <Globe size={16} className="text-orange-500" />
                     </div>
                     <h4 className="text-[13px] font-bold text-text-primary mb-1">Get Extension</h4>
-                    <p className="text-text-muted text-[11px] leading-relaxed">Install the Firelink Companion extension on your browser.</p>
+                    <p className="text-text-muted text-[11px] leading-relaxed">Install Firelink Companion for Firefox or Chromium browsers.</p>
                   </div>
                   <div className="space-y-2">
                     <button
@@ -1257,10 +1257,10 @@ className="app-button px-3 py-1.5 text-[12px] flex items-center gap-1.5 disabled
                     </button>
                     <button
                       type="button"
-                      onClick={() => void openExternalUrl(FIRELINK_EXTENSION_RELEASES_URL, 'GitHub Releases')}
+                      onClick={() => void openExternalUrl(FIRELINK_EXTENSION_RELEASES_URL, 'Chromium release ZIP')}
                       className="w-full bg-item-hover hover:bg-item-hover/80 text-text-primary border border-border-modal font-medium py-1 px-2 rounded text-[11px] flex items-center justify-center gap-1 transition-colors"
                     >
-                      GitHub Releases
+                      Chromium ZIP
                       <ExternalLink size={11} />
                     </button>
                   </div>