Add a typed platform package to decouple the frontend from Tauri (#539)

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

apps/yaak-client/components/Settings/SettingsLicense.tsx

@@ -1,4 +1,3 @@
-import { openUrl } from "@tauri-apps/plugin-opener";
 import { useLicense } from "@yaakapp-internal/license";
 import { Banner, HStack, Icon, VStack } from "@yaakapp-internal/ui";
 import { differenceInDays } from "date-fns";
@@ -12,6 +11,7 @@ import { Button } from "../core/Button";
 import { Link } from "../core/Link";
 import { PlainInput } from "../core/PlainInput";
 import { Separator } from "../core/Separator";
+import { platform } from "@yaakapp-internal/platform";
 
 export function SettingsLicense() {
   return (
@@ -135,7 +135,7 @@ function SettingsLicenseCmp() {
           <Button
             color="secondary"
             size="sm"
-            onClick={() => openUrl("https://yaak.app/dashboard?intent=app.license.support")}
+            onClick={() => platform.openUrl("https://yaak.app/dashboard?intent=app.license.support")}
             rightSlot={<Icon icon="external_link" />}
           >
             Direct Support
@@ -151,7 +151,7 @@ function SettingsLicenseCmp() {
             color="primary"
             rightSlot={<Icon icon="external_link" />}
             onClick={() =>
-              openUrl(pricingUrl(`app.license.purchase.${check.data?.status ?? "unknown"}`))
+              platform.openUrl(pricingUrl(`app.license.purchase.${check.data?.status ?? "unknown"}`))
             }
           >
             Purchase License