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/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