yoda: re-apply hard rename — libcosmic → libcosmic-yoda (0.1.0-yoda)

Reverts the soft-fork pivot (6736a596). Strategy chosen with user:
full cascade fork. Every consumer (leyoda/cosmic-files + each leyoda/app)
depends on libcosmic-yoda by explicit path, so there are no transitive
deps left asking for the upstream 'libcosmic' crate — no [patch]
unification issues, no two-version traps.

Changes:
- Cargo.toml: name = libcosmic-yoda, version = 0.1.0-yoda
- i18n/*/libcosmic.ftl -> libcosmic_yoda.ftl (71 locales)
- examples/*/Cargo.toml dep refs back to libcosmic-yoda
- compat stub features (winit=[], x11=[]) kept for upstream deps that
  might still request them during the migration window

cargo check --lib passes.

i18n/bg/libcosmic_yoda.ftl

@@ -0,0 +1,29 @@
+# Context Drawer
+close = Затваряне
+# About
+license = Лиценз
+links = Връзки
+developers = Разработчици
+designers = Дизайнери
+artists = Художници
+translators = Преводачи
+documenters = Документатори
+january = Януари { $year }
+february = Февруари { $year }
+march = Март { $year }
+april = Април { $year }
+may = Май { $year }
+june = Юни { $year }
+july = Юли { $year }
+august = Август { $year }
+september = Септември { $year }
+october = Октомври { $year }
+november = Ноември { $year }
+december = Декември { $year }
+monday = Пн
+tuesday = Вт
+wednesday = Ср
+thursday = Чт
+friday = Пт
+saturday = Сб
+sunday = Нд