desktop-v1.12.4

## What's Changed
* fix(import): restore git-init for non-git folders on v2 folder import by @AviPeltz in https://github.com/superset-sh/superset/pull/5036
* feat(desktop): add delete + pin toggle to v2 Workspaces rows by @AviPeltz in https://github.com/superset-sh/superset/pull/5146
* chore(desktop): bump version to 1.12.3 by @saddlepaddle in https://github.com/superset-sh/superset/pull/5139
* Switch Windsurf to Devin by @saddlepaddle in https://github.com/superset-sh/superset/pull/5151
* fix(desktop): open tanstack-db.sqlite in WAL mode for crash durability by @Kitenite in https://github.com/superset-sh/superset/pull/5155
* fix(panes): restore v2 tab drag-to-reorder broken by focus fix by @Kitenite in https://github.com/superset-sh/superset/pull/5159
* fix(desktop): keep diff-pane PR comments from overflowing the pane by @Kitenite in https://github.com/superset-sh/superset/pull/5157
* feat(panes): drag a tab into a pane to merge its panes as a split by @Kitenite in https://github.com/superset-sh/superset/pull/5160
* revert(desktop): drop desktop_version renderer super property (#5117) by @saddlepaddle in https://github.com/superset-sh/superset/pull/5164
* feat(desktop): route new signups to v1 for experiment, hide v2 banner by @saddlepaddle in https://github.com/superset-sh/superset/pull/5166
* docs: add Linear custom-script integration guide by @saddlepaddle in https://github.com/superset-sh/superset/pull/5169
* feat(marketing): add Reddit Pixel tracking with download conversions by @AviPeltz in https://github.com/superset-sh/superset/pull/5165
* fix(host-service): make workspace delete reliably tear down terminal sessions by @saddlepaddle in https://github.com/superset-sh/superset/pull/5168
* chore(experiment): set v1 experiment start to 3pm PDT today by @saddlepaddle in https://github.com/superset-sh/superset/pull/5178
* feat(desktop): add 'Start from a template' project gallery by @saddlepaddle in https://github.com/superset-sh/superset/pull/5180
* chore(desktop): bump version to 1.12.4 by @saddlepaddle in https://github.com/superset-sh/superset/pull/5179
* feat(desktop): support v1 in onboarding, remove legacy v1 starter surfaces by @saddlepaddle in https://github.com/superset-sh/superset/pull/5185


**Full Changelog**: https://github.com/superset-sh/superset/compare/desktop-v1.12.3...desktop-v1.12.4