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/en/libcosmic.ftl

@@ -1,39 +0,0 @@
-# Context Drawer
-close = Close
-
-# About
-license = License
-links = Links
-developers = Developers
-designers = Designers
-artists = Artists
-translators = Translators
-documenters = Documenters
-
-# Calendar
-january = January { $year }
-february = February { $year }
-march = March { $year }
-april = April { $year }
-may = May { $year }
-june = June { $year }
-july = July { $year }
-august = August { $year }
-september = September { $year }
-october = October { $year }
-november = November { $year }
-december = December { $year }
-monday = Monday
-mon = Mon
-tuesday = Tuesday
-tue = Tue
-wednesday = Wednesday
-wed = Wed
-thursday = Thursday
-thu = Thu
-friday = Friday
-fri = Fri
-saturday = Saturday
-sat = Sat
-sunday = Sunday
-sun = Sun