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/ru/libcosmic.ftl

@@ -1,34 +0,0 @@
-close = Закрыть
-license = Лицензия
-links = Ссылки
-developers = Разработчики
-designers = Дизайнеры
-artists = Художники
-translators = Переводчики
-documenters = Авторы документации
-january = Январь { $year }
-february = Февраль { $year }
-march = Март { $year }
-april = Апрель { $year }
-may = Май { $year }
-june = Июнь { $year }
-july = Июль { $year }
-august = Август { $year }
-september = Сентябрь { $year }
-october = Октябрь { $year }
-november = Ноябрь { $year }
-december = Декабрь { $year }
-monday = Понедельник
-tuesday = Вторник
-wednesday = Среда
-thursday = Четверг
-friday = Пятница
-saturday = Суббота
-sunday = Воскресенье
-mon = Пн
-tue = Вт
-wed = Ср
-thu = Чт
-fri = Пт
-sat = Сб
-sun = Вс