docs(#359): put the offband.app URLs back in

Owner's call: include the live web URLs and sequence the main promotion
(which deploys offband.app) BEFORE the release tag, so offband.app is up
and verified before the notes go public. Avoids a pointless second push
just to add URLs.

Restored offband.app in the platform list, changelog, and Discord link.

Part of #160. Agent: SapphireCompass (session 8d755b5e)

CHANGELOG.md

@@ -56,8 +56,8 @@ release cut end-to-end through CI (signed, all platforms).
 
 ### Under the hood
 
-- Every release is now built, signed, and published across Android, Windows, and
-  Linux automatically through CI. A web build is wired up and coming soon.
+- Offband is now available as a web app at offband.app, and every release is
+  built, signed, and published across Android, Windows, Linux, and web through CI.
 
 ## [1.1.2-rc.3] - 2026-07-17
 

discord/1.2.0.md

@@ -13,7 +13,7 @@ A ground-up interface redesign, a real database under the hood, GIFs that work a
 ⚡ Plus a **snappier app** from the new storage engine, **desktop window position** remembered between launches, contact settings from the long-press menu, deeper mesh diagnostics, and you can't accidentally block your own node anymore.
 
 **📥 Download for your platform:** https://github.com/OffbandMesh/meshcore-client/releases/tag/v1.2.0
-🌐 A browser version is coming soon.
+🌐 **Or run it right in your browser, no install:** https://offband.app
 🔗 Project home: https://offband.org
 📝 Full changelog is in the release notes at the link above.
 

release-notes/1.2.0.md

@@ -9,15 +9,13 @@ shipped to every platform automatically.
 
 ### One app, every platform
 
-From this release on, every Offband build ships at once, signed with the same key
-so updates just work:
+From this release on, every Offband build ships everywhere at once, signed with
+the same key so updates just work:
 
 - **Android**: install from Google Play or sideload the signed APK
 - **Windows**: desktop build
 - **Linux**: desktop build
-
-A **browser version is on the way** as well, so you will be able to run Offband
-with no install at all. More on that soon.
+- **Web**: run it right in your browser, no install, at [offband.app](https://offband.app)
 
 Pick your platform below.