feat(ui): add copy-last-40-lines button to log visualizer

src/ClaudeDo.Localization/locales/de.json

@@ -310,6 +310,10 @@
       "refresh": "Aktualisieren",
       "empty": "Keine Logs in den letzten 30 Minuten.",
       "count": "{0} Einträge",
+      "copyLast": "Letzte 40 kopieren",
+      "copyLastTooltip": "Kopiert die letzten 40 sichtbaren Zeilen in die Zwischenablage",
+      "copied": "{0} Zeilen kopiert",
+      "copyFailed": "Kopieren fehlgeschlagen",
       "footerHint": "logs",
       "openTooltip": "Aktuelle Worker-Logs anzeigen"
     },

src/ClaudeDo.Localization/locales/en.json

@@ -311,7 +311,11 @@
       "empty": "No logs in the last 30 minutes.",
       "count": "{0} entries",
       "footerHint": "logs",
-      "openTooltip": "View recent worker logs"
+      "openTooltip": "View recent worker logs",
+      "copyLast": "Copy last 40",
+      "copyLastTooltip": "Copy the last 40 visible lines to the clipboard",
+      "copied": "{0} lines copied",
+      "copyFailed": "Copy failed"
     },
     "about": {
       "title": "ABOUT",