A Mirror window for sketch entities, holding both picks until OK (#734)

Sketch Mirror now opens a tool window with Entities and Mirror line inputs, so both picks stay visible and editable until OK, replacing the old click-then-right-click flow.

crates/ui-egui/src/locales/de.json

@@ -196,6 +196,7 @@
   "ui.measure": "Messen",
   "ui.midpoint": "Mittelpunkt",
   "ui.mirror": "Spiegeln",
+  "ui.mirror_line": "Spiegelachse",
   "ui.modify": "Ändern",
   "ui.move": "Verschieben",
   "ui.multiple": "Mehrfach",

crates/ui-egui/src/locales/en.json

@@ -471,6 +471,7 @@
   "ui.measure": "Measure",
   "ui.midpoint": "Midpoint",
   "ui.mirror": "Mirror",
+  "ui.mirror_line": "Mirror line",
   "ui.modify": "Modify",
   "ui.move": "Move",
   "ui.multiple": "Multiple",

crates/ui-egui/src/locales/ja.json

@@ -471,6 +471,7 @@
   "ui.measure": "計測",
   "ui.midpoint": "中点",
   "ui.mirror": "ミラー",
+  "ui.mirror_line": "ミラー線",
   "ui.modify": "修正",
   "ui.move": "移動",
   "ui.multiple": "複数",

crates/ui-egui/src/locales/ko.json

@@ -196,6 +196,7 @@
   "ui.measure": "측정",
   "ui.midpoint": "중간점",
   "ui.mirror": "대칭 복사",
+  "ui.mirror_line": "대칭선",
   "ui.modify": "수정",
   "ui.move": "이동",
   "ui.multiple": "다중",