Add an update message for 1.3.0

Package Control shows it after upgrading. It points Wayland users to
the setup command for the Ctrl detection helper and introduces the
`preview_tabs` setting.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: FichteFoll

messages.json

@@ -0,0 +1,3 @@
+{
+  "1.3.0": "messages/1.3.0.md"
+}

messages/1.3.0.md

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+1.3.0 (2026-10-17)
+------------------
+
+TabStack now supports native Wayland sessions!
+Because Wayland does not let applications query the keyboard state,
+detecting the Ctrl release requires a small helper program
+that you build and install yourself,
+since it needs elevated capabilities to read the input devices.
+Run "TabStack: Set Up Ctrl Detection for Wayland" from the Command Palette
+to review its source and get the setup instructions.
+
+The new `preview_tabs` setting controls
+whether the highlighted tab is shown while moving through the quick panel.
+Set it to `false` to stay on the current tab
+until the switch is committed.