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/nl/libcosmic_yoda.ftl

@@ -0,0 +1,27 @@
+close = Sluiten
+license = Licentie
+january = Januari { $year }
+february = Februari { $year }
+march = Maart { $year }
+april = April { $year }
+may = Mei { $year }
+june = Juni { $year }
+july = Juli { $year }
+august = Augustus { $year }
+september = September { $year }
+october = Oktober { $year }
+november = November { $year }
+december = December { $year }
+monday = Ma
+tuesday = Di
+wednesday = Woe
+thursday = Do
+friday = Vrij
+saturday = Za
+sunday = Zo
+links = Links
+developers = Ontwikkeling
+designers = Ontwerp
+translators = Vertaling
+documenters = Documentatie
+artists = Vormgeving