v1.8.58: results context menu — Copy Cell/Row/All As 16 formats

Right-click on results table:
- Copy Cell — single cell value
- Copy Row — tab-delimited row
- Copy Row As → 16 formats submenu
- Copy All As → 16 formats submenu

Formats: Excel CSV, Tab-delimited, HTML, XML, SQL INSERTs,
SQL INSERT IGNOREs, SQL REPLACEs, SQL DELETE/INSERTs,
SQL UPDATEs, LaTeX, Textile, Jira, PHP Array, Markdown,
JSON, JSON Lines

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

core/i18n.py

@@ -340,6 +340,11 @@ _EN = {
     "tree_no_tables": "(no tables)",
     "tree_no_columns": "(no columns)",
     "tree_connected": "Connected",
+    # Results context menu
+    "res_copy_cell": "Copy Cell",
+    "res_copy_row": "Copy Row",
+    "res_copy_row_as": "Copy Row As",
+    "res_copy_all_as": "Copy All As",
     "query_exported": "Exported to {path}",
 
     # Redis tab
@@ -766,6 +771,11 @@ _RU = {
     "tree_no_tables": "(нет таблиц)",
     "tree_no_columns": "(нет колонок)",
     "tree_connected": "Подключено",
+    # Results context menu
+    "res_copy_cell": "Копировать ячейку",
+    "res_copy_row": "Копировать строку",
+    "res_copy_row_as": "Копировать строку как",
+    "res_copy_all_as": "Копировать всё как",
 
     # Redis tab
     "redis_clear": "Очистить",
@@ -1191,6 +1201,11 @@ _ZH = {
     "tree_no_tables": "(无表)",
     "tree_no_columns": "(无列)",
     "tree_connected": "已连接",
+    # Results context menu
+    "res_copy_cell": "复制单元格",
+    "res_copy_row": "复制行",
+    "res_copy_row_as": "复制行为",
+    "res_copy_all_as": "全部复制为",
 
     # Redis tab
     "redis_clear": "清除",