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/fr/libcosmic.ftl

@@ -1,34 +0,0 @@
-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