diff --git a/.gitignore b/.gitignore
index 864575245..399acf48d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,6 +23,11 @@ dist-electron
 # Desktop production config is public (backend URL, etc.) — track it so
 # `pnpm package` produces a release-ready build without extra setup.
 !apps/desktop/.env.production
+# Desktop staging config is public (staging API/web URLs) — track it so
+# `pnpm dev:desktop:staging` works from a fresh checkout instead of relying
+# on a hand-written local env file (MUL-5025: a misnamed VITE_ var there
+# silently broke copy-link URLs).
+!apps/desktop/.env.staging
 # Mobile staging config is public (staging API URL) — track it so a fresh
 # checkout can run `pnpm dev:mobile:staging` / `ios:mobile*:staging` without
 # the user having to copy `.env.example` first.
diff --git a/apps/desktop/.env.staging b/apps/desktop/.env.staging
new file mode 100644
index 000000000..bd28da7c5
--- /dev/null
+++ b/apps/desktop/.env.staging
@@ -0,0 +1,11 @@
+# Internal staging environment; not a public support environment.
+# Used by `pnpm dev:desktop:staging` (`electron-vite dev --mode staging`).
+# Personal overrides go in .env.staging.local.
+VITE_API_URL=https://multica-api.copilothub.ai
+
+# VITE_APP_URL is the web app origin used for copy-link/open-in-browser URLs.
+# Do not point it at the API host. It must be explicit here: the `api.<host>`
+# derivation in shared/runtime-config.ts doesn't match this deployment's
+# `multica-api.<domain>` naming and would fall back to the API origin
+# (MUL-5025).
+VITE_APP_URL=https://multica-app.copilothub.ai
diff --git a/apps/mobile/.env.staging b/apps/mobile/.env.staging
index 16b0fb60b..2679127da 100644
--- a/apps/mobile/.env.staging
+++ b/apps/mobile/.env.staging
@@ -1,10 +1,9 @@
+# Internal staging environment; not a public support environment.
 # Used by `pnpm dev:mobile:staging` and the `ios:device:staging[:release]`
 # scripts. Loaded via `dotenv-cli` (see package.json), NOT by Expo's auto-
 # loader — Expo only auto-loads .env.<NODE_ENV>.local files.
 EXPO_PUBLIC_API_URL=https://multica-api.copilothub.ai
 
 # Optional. Enables "Copy link" / "Open on web" actions in issue / project /
-# comment menus. Without it those menu items just don't appear. Fill in the
-# staging web host when you have it (canonical value lives in
-# apps/desktop/.env.staging on a teammate's machine).
-# EXPO_PUBLIC_WEB_URL=https://<staging-web-host>
+# comment menus. Without it those menu items just don't appear.
+EXPO_PUBLIC_WEB_URL=https://multica-app.copilothub.ai