Select Color: Document and Color books tabs

Document tab: every concrete colour the drawing uses (objects, block
definitions and layers), found in one pass when the panel opens, as a
grid of swatches sortable by recently used, most used, colour and colour
number. The recently-used list is now kept per drawing, so the ribbon's
Recent row shows this drawing's colours.

Color books tab: load AutoCAD .acb colour books (remembered in the
settings on desktop), browse them page by page with the page strip,
search by name and see the RGB equivalent. A book colour is applied as
RGB plus its BOOK$NAME identity on objects and layers instead of
dropping the name.

Strings translated into all 22 locales.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013rGmDUNr1hUf4zo1X3dak8

locales/it-IT/opencadstudio.ftl

@@ -1343,6 +1343,21 @@ common =
     .color-hex = Hex
     .nearest-index-color = Indice più vicino
     .exact-index-match = Corrispondenza esatta indice
+    .color-recently-used = Usati di recente
+    .color-most-used = Più usati
+    .color-number = Numero colore
+    .color-in-drawing = Colori in questo disegno
+    .color-sort = Ordina
+    .color-no-drawing-colors = Ancora nessun colore in questo disegno
+    .color-books = Album colori
+    .color-no-books = Nessun album colori caricato
+    .color-load-book = Carica album colori (.acb)
+    .color-book-label = Album colori
+    .color-rgb-equivalent = Equivalente RGB
+    .color-no-match = Nessun colore corrispondente
+    .color-not-a-book = Non è un album colori
+    .color-book-encrypted = Questo album colori è crittografato e non può essere letto
+    .color-book-empty = L'album colori non contiene colori
     .cad-color-index-aci-10-249 = ACI Indice colori 10–249
     .grayscale-250-255 = { common.grayscale } 250–255
     .isometric-drafting = Disegno isometrico