Let a multi-selection be copied as plain lines as well as a list

Copying several notes only produced a numbered list, which is wrong for
pasting into a prompt that already has structure. The selection now
offers both forms, Shift+click selects a range, and a selection bar
makes it obvious that more than one note is selected. Esc clears the
selection before it hides the panel.

README.md

@@ -8,8 +8,9 @@ to your work. Click anything to copy it back to your clipboard.
 - **Capture from anywhere** — select text in any app and tap **Left Shift twice**.
 - **Photos** — paste (Cmd+V), drag & drop, or add via the photo button.
 - **Sections** — type `# Name` in the composer; Cmd+K switches sections.
-- **Copy as List** — Cmd+click to multi-select, right-click → Copy as List
-  (or Shift+Cmd+C) for a numbered list ready to paste into a chat.
+- **Copy as List / Copy as Lines** — Cmd+click to multi-select (Shift+click for
+  a range), then copy the selection as a numbered list or as plain
+  newline-separated text, from the selection bar or the right-click menu.
 - **Merge Notes, Mark as Done, Edit, Move To** — right-click any item.
 - **Search** — Cmd+F searches across all sections.
 - **Sync (optional)** — generate an 8-digit code (`1234-5678`) on one Mac and
@@ -29,6 +30,8 @@ to your work. Click anything to copy it back to your clipboard.
 | Focus composer | Cmd+N |
 | Sync settings | Cmd+, |
 | Copy selection as numbered list | Shift+Cmd+C |
+| Copy selection as plain lines | Option+Cmd+C |
+| Clear selection | Esc |
 | Close panel | Esc |
 
 Double-Shift gestures require **Accessibility access** (Prompt reads the