chore: add the missing desktop release changesets

The Host port fix and the dedicated desktop update channel both merged without a changeset, so neither is versioned or recorded in the desktop changelog.

Author: elkaix

.changeset/desktop-dedicated-update-channel.md

@@ -0,0 +1,5 @@
+---
+"@pymodel/pythinker-desktop": patch
+---
+
+Publish desktop releases to a dedicated update channel so update checks resolve a desktop build instead of an unrelated release, and fail the release when a packaged build carries no update feed.

.changeset/desktop-pin-host-port.md

@@ -0,0 +1,5 @@
+---
+"@pymodel/pythinker-desktop": patch
+---
+
+Pin the Host port so the desktop app reconnects to its own Host, and stop reporting builds that cannot self-update as update errors.