feat(app): shorten the Work sandbox explanation to one line

Two sentences to say one thing. The second told the user what Cancel does,
which the Cancel button and the tab they came from already imply.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: quickbeard

CHANGELOG.md

@@ -12,9 +12,8 @@ file is the human-readable summary of what changed and why.
 - **Switching to Work with no sandbox explains itself** — clicking **Work**
   before you have a sandbox opens the Add sandbox dialog, which was a dialog
   you did not ask for with nothing to say about why it appeared. It now leads
-  with the reason: Work runs each session inside a sandbox, and cancelling
-  leaves you on Code. Reaching the same dialog deliberately, from Settings,
-  is unchanged.
+  with the reason: Work requires a sandbox environment to run sessions.
+  Reaching the same dialog deliberately, from Settings, is unchanged.
 - **The CPU and memory fields explain themselves** — the Add sandbox dialog
   offered two unlabelled optional boxes with no hint of what a sandbox gets if
   you leave them empty, and the memory box ran past the edge of the dialog.

packages/app/src/i18n/en.ts

@@ -379,8 +379,7 @@ export const dict = {
   "workspace.empty.none": "No sandbox yet. Create one to work in an isolated environment.",
   "workspace.empty.starting": "Your sandbox is not running yet. It appears here once it is ready.",
   "workspace.empty.stopped": "Your sandbox is stopped. Start it again from Settings → Servers.",
-  "sandbox.add.workIntro":
-    "Work runs each session inside a sandbox, so it needs one before you can use it. Cancel to stay on Code.",
+  "sandbox.add.workIntro": "Work requires a sandbox environment to run sessions.",
   "sandbox.server.add": "Add sandbox",
   "sandbox.server.label": "Sandbox",
   "sandbox.server.menu.label": "Sandbox",

packages/app/src/i18n/es.ts

@@ -370,8 +370,7 @@ export const dict = {
   "workspace.empty.none": "Aún no hay ningún sandbox. Crea uno para trabajar en un entorno aislado.",
   "workspace.empty.starting": "Tu sandbox todavía no está en marcha. Aparecerá aquí cuando esté listo.",
   "workspace.empty.stopped": "Tu sandbox está detenido. Vuelve a iniciarlo desde Ajustes → Servidores.",
-  "sandbox.add.workIntro":
-    "Trabajo ejecuta cada sesi\u00f3n dentro de un sandbox, as\u00ed que necesitas uno para poder usarlo. Cancela para quedarte en C\u00f3digo.",
+  "sandbox.add.workIntro": "Trabajo requiere un entorno de sandbox para ejecutar sesiones.",
   "sandbox.server.add": "Añadir sandbox",
   "sandbox.server.label": "Sandbox",
   "sandbox.server.menu.label": "Sandbox",