Add task specifications for Phase 5 advanced input features

- 015-keyboard-shortcuts.md (completed)
- 020-command-palette.md (completed)
- 021-file-attachments.md (next: @mentions, drag-drop, chips)
- 022-long-paste-handling.md (summarize long pastes)
- 023-symbol-attachments.md (LSP integration)
- 024-agent-attachments.md (agent context)
- 025-image-clipboard-support.md (image handling)

tasks/todo/022-long-paste-handling.md

@@ -0,0 +1,29 @@
+---
+title: Long Paste Handling
+description: Summarize large pasted text into attachments.
+---
+
+Implement Long Paste Handling
+
+---
+
+### Detect Long Pastes
+
+Monitor clipboard paste events for text content. Identify if the pasted text exceeds a defined length (e.g., >150 characters or >3 lines).
+
+---
+
+### Create Summarized Attachments
+
+If a paste is identified as "long", prevent direct insertion into the input field. Instead, create a new text attachment containing the full content.
+
+Display a summarized chip for the attachment, such as `[pasted #1 10+ lines]`.
+
+---
+
+### Acceptance Criteria
+
+- Pasting short text directly inserts it into the input.
+- Pasting long text creates a summarized attachment chip.
+- The full content of the long paste is retained within the attachment for submission.
+- Multiple long pastes create distinct numbered chips.