fix(library): empty-state on Mainstage, Albums, New Releases, Random Albums (#750)

* fix(library): show empty-state on Mainstage, Albums, New Releases, Random Albums

When the active library has no albums, Mainstage and the three album-list
pages rendered a fully blank page — every rail and grid was empty but
nothing told the user why. Add a shared `common.libraryEmpty` message
(all 9 locales) and render it in place of the empty grid:

* Home: when no rail has any albums after loading.
* Albums: when no albums and no filter (genre/year/starred/comp) is
  active — filtered "no matches" is a separate state and stays as-is.
* New Releases: when no albums and no genre filter is active.
* Random Albums: when no albums after loading.

Pages that already had a dedicated empty-state (Artists, Genres,
Composers, Playlists, Favorites, MostPlayed, LosslessAlbums,
LabelAlbums, InternetRadio) are left alone — their wording is
intentional and per-page.

* docs(changelog): note empty-library states on Mainstage / album lists (#750)

src/locales/de/common.ts

@@ -63,4 +63,5 @@ export const common = {
   more: 'mehr',
   yearRange: 'Jahresbereich',
   clearAll: 'Alles zurücksetzen',
+  libraryEmpty: 'Deine Bibliothek ist leer.',
 };

src/locales/en/common.ts

@@ -63,4 +63,5 @@ export const common = {
   more: 'more',
   yearRange: 'Year Range',
   clearAll: 'Clear all',
+  libraryEmpty: 'Your library is empty.',
 };

src/locales/es/common.ts

@@ -53,4 +53,5 @@ export const common = {
   more: 'más',
   yearRange: 'Rango de años',
   clearAll: 'Limpiar todo',
+  libraryEmpty: 'Tu biblioteca está vacía.',
 };

src/locales/fr/common.ts

@@ -53,4 +53,5 @@ export const common = {
   more: 'plus',
   yearRange: 'Plage d\'années',
   clearAll: 'Tout effacer',
+  libraryEmpty: 'Votre bibliothèque est vide.',
 };

src/locales/nb/common.ts

@@ -53,4 +53,5 @@ export const common = {
   more: 'mer',
   yearRange: 'Årsspenn',
   clearAll: 'Tøm alt',
+  libraryEmpty: 'Biblioteket ditt er tomt.',
 };

src/locales/nl/common.ts

@@ -53,4 +53,5 @@ export const common = {
   more: 'meer',
   yearRange: 'Jaarbereik',
   clearAll: 'Alles wissen',
+  libraryEmpty: 'Je bibliotheek is leeg.',
 };

src/locales/ro/common.ts

@@ -63,4 +63,5 @@ export const common = {
   more: 'mai mult',
   yearRange: 'Interval de an',
   clearAll: 'Golește tot',
+  libraryEmpty: 'Biblioteca ta este goală.',
 };

src/locales/ru/common.ts

@@ -53,4 +53,5 @@ export const common = {
   more: 'еще',
   yearRange: 'Диапазон лет',
   clearAll: 'Очистить всё',
+  libraryEmpty: 'Ваша библиотека пуста.',
 };

src/locales/zh/common.ts

@@ -53,4 +53,5 @@ export const common = {
   more: '更多',
   yearRange: '年份范围',
   clearAll: '清除全部',
+  libraryEmpty: '你的音乐库是空的。',
 };