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/en/libcosmic_yoda.ftl

@@ -0,0 +1,39 @@
+# 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