Adds a new toggler "Place buttons on the left (macOS style)" in
*Desktop → Window Management → Window controls*, next to the existing
show_maximize / show_minimize controls. When enabled, writes
`WindowControlsPosition::Start` into the `CosmicTk` config
(com.system76.CosmicTk); when disabled, writes `End` (default).
All libcosmic-based applications rebuilt against a libcosmic that
exposes `WindowControlsPosition` pick up the change live through the
existing cosmic-config subscription.
Includes:
- new Message variant WindowControlsPositionStart(bool) + handler
- `window-controls.position-start` fluent key added in en + fr locales
- Cargo.toml: activate local [patch] override to libcosmic (dev only,
not suitable for upstream merge)
Requires: libcosmic >= 5c331935 (header_bar WindowControlsPosition).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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