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/fr/libcosmic_yoda.ftl

@@ -0,0 +1,34 @@
+close = Fermer
+documenters = Rédacteurs
+translators = Traducteurs
+artists = Artistes
+license = Licence
+links = Liens
+developers = Développeurs
+january = Janvier { $year }
+february = Février { $year }
+april = Avril { $year }
+march = Mars { $year }
+november = Novembre { $year }
+friday = Vendredi
+tuesday = Mardi
+may = Mai { $year }
+wednesday = Mercredi
+monday = Lundi
+december = Décembre { $year }
+sunday = Dimanche
+june = Juin { $year }
+saturday = Samedi
+august = Août { $year }
+july = Juillet { $year }
+thursday = Jeudi
+september = Septembre { $year }
+october = Octobre { $year }
+designers = Designers
+mon = Lun
+tue = Mar
+wed = Mer
+thu = Jeu
+fri = Ven
+sat = Sam
+sun = Dim