chore: add changesets for the desktop app branch

Author: elkaix

.changeset/desktop-design-port.md

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+---
+"@pymodel/pythinker-code": minor
+---
+
+Match the desktop app's sidebar, collapse animation, empty-state visuals, and typography to the desktop design.

.changeset/desktop-update-settings.md

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+---
+"@pymodel/pythinker-code": minor
+---
+
+Add a Desktop app section to web settings with automatic updates on by default, a manual update check, and a restart-to-update action.

.changeset/journal-question-events.md

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+---
+"@pymodel/pythinker-code": patch
+---
+
+Fix sessions failing to load with an invalid event journal error after questions or approvals were resolved.

.changeset/node-20-support.md

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+---
+"@pymodel/pythinker-code": patch
+---
+
+Run on Node 20 and newer by only re-executing for FFI support on Node 26.4+.

.changeset/session-listing-resilience.md

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+---
+"@pymodel/pythinker-code": patch
+---
+
+Skip invalid sessions during listing instead of failing the whole list.

.changeset/web-brand-refresh.md

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+---
+"@pymodel/pythinker-code": minor
+---
+
+Refresh the web UI accent color and show the animated mascot on workflow cards, the activity spinner, and the empty state.

.changeset/web-transcript-dedupe.md

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+---
+"@pymodel/pythinker-code": patch
+---
+
+Fix duplicated streamed transcript copies and lost paragraph breaks in the web UI.