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/zh-Hant/libcosmic_yoda.ftl

@@ -0,0 +1,34 @@
+close = 關閉
+developers = 開發人員
+designers = 設計人員
+artists = 美編設計
+translators = 翻譯人員
+documenters = 文件編輯人員
+january = { $year } 年 1 月
+monday = 星期一
+tuesday = 星期二
+wednesday = 星期三
+thursday = 星期四
+friday = 星期五
+saturday = 星期六
+sunday = 星期日
+mon = 週一
+tue = 週二
+wed = 週三
+thu = 週四
+fri = 週五
+sat = 週六
+sun = 週日
+license = 授權
+links = 連結
+february = { $year } 年 2 月
+march = { $year } 年 3 月
+april = { $year } 年 4 月
+may = { $year } 年 5 月
+june = { $year } 年 6 月
+july = { $year } 年 7 月
+august = { $year } 年 8 月
+september = { $year } 年 9 月
+october = { $year } 年 10 月
+november = { $year } 年 11 月
+december = { $year } 年 12 月