v1.0.26: point auto-updater at stable-rebuild branch

GITEA_BASE was pointing at master (v1.0.22), so Check for Updates
always said "already up to date". Now points at stable-rebuild so
updates are served from the correct branch. Also bumps version.json
to 1.0.26.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

com.pdma.notion-timer.sdPlugin/bin/plugin.js

@@ -6439,7 +6439,7 @@ async function stopTimer(token, entryId) {
 
 // src/plugin.ts
 var CURRENT_VERSION = "1.0.26";
-var GITEA_BASE = "https://gitea.pdmarf.co.uk/pdm/stream_deck_notion_timer/raw/branch/master";
+var GITEA_BASE = "https://gitea.pdmarf.co.uk/pdm/stream_deck_notion_timer/raw/branch/stable-rebuild";
 var SIGNING_PUBLIC_KEY = `-----BEGIN PUBLIC KEY-----
 MCowBQYDK2VwAyEAN7ko8TUpuPzPAJuKAZCRjV0c4ZSlou5d9pUAF6o12b4=
 -----END PUBLIC KEY-----`;