rename: libcosmic → libcosmic-yoda (fork 0.1.0-yoda)

Fork point: pop-os/libcosmic 1.0.0 + perf/quickwins-bundle + macOS
window controls feature. From here the crate diverges under the yoda
lineage with its own versioning.

Changes:
- Cargo.toml: name = libcosmic-yoda, version = 0.1.0-yoda
- [lib] name = cosmic kept unchanged — consumer code still does 'use cosmic::...'
- examples/*/Cargo.toml: updated all libcosmic dep references to libcosmic-yoda
- i18n/*/libcosmic.ftl renamed to libcosmic_yoda.ftl (71 locales) to match
  the new name expected by fluent_language_loader!() macro

cargo check --lib passes. Examples not yet validated — Phase 2 (Wayland-only
cut) will rework them anyway.

i18n/zh-Hans/libcosmic.ftl

@@ -1,34 +0,0 @@
-close = 关闭
-license = 许可证
-links = 链接
-developers = 开发者
-designers = 设计师
-translators = 译者
-january = { $year }年1月
-february = { $year }年2月
-march = { $year }年3月
-april = { $year }年4月
-may = { $year }年5月
-june = { $year }年6月
-july = { $year }年7月
-august = { $year }年8月
-september = { $year }年9月
-october = { $year }年10月
-november = { $year }年11月
-december = { $year }年12月
-monday = 星期一
-tuesday = 星期二
-wednesday = 星期三
-thursday = 星期四
-friday = 星期五
-saturday = 星期六
-sunday = 星期日
-artists = 艺术家
-documenters = 文档作者
-mon = 周一
-tue = 周二
-wed = 周三
-thu = 周四
-fri = 周五
-sat = 周六
-sun = 周日