agentydragon(tasks): add task 20 render patch content in chat display window for approve/deny

agentydragon/tasks/20-render-patch-content-in-chat-display.md

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+---
+id: 20
+title: Render Patch Content in Chat Display Window for Approve/Deny
+status: Not started  # one of: Not started, Started, Needs manual review, Done, Cancelled
+summary: Improve inline display of patch hunks in chat messages for approval workflows.
+goal: |
+  Adjust the chat UI so that when the assistant proposes patches for approval or denial:
+  - The current patch being queried is shown in full, with file paths relative to the CWD (or absolute if outside CWD).
+  - Previous patches collapse to a configurable number of context lines (e.g. first and last X lines).
+  - Omit verbose event logs (e.g. `PatchApplyEnd(PatchApplyEndEvent { ... })`), replacing them with concise annotations like "patch applied".
+  - Maintain clear separation between patches and conversational messages.
+---
+> *This task is specific to the chat UI renderer.*
+
+## Acceptance Criteria
+
+- When displaying a patch for approve/deny, the full diff for the active patch is rendered inline in the chat window.
+- Older or superseded patches collapse to show only up to N lines of context, with an indicator (e.g. "... 10 lines collapsed ...").
+- File paths in diff headers are shown relative to the current working directory, unless the file resides outside the CWD.
+- Event logs around patch application are simplified: drop structured event data and replace with a simple status note (e.g. "patch applied").
+- Configurable parameter (e.g. `patch_context_lines`) controls the number of context lines for collapsed hunks.
+
+## Implementation
+
+**How it was implemented**  
+- Extend the chat renderer to detect patch approval prompts and render diffs using a custom formatter.
+- Compute relative paths via `Path::strip_prefix`, falling back to full path if outside CWD.
+- Track the current patch ID and render its full content; collapse previous patch bodies according to `patch_context_lines` setting.
+- Replace verbose event debug output with a single-line status message.
+
+## Notes
+
+- Users can override `patch_context_lines` in their config to see more or fewer collapsed lines.
+- Ensure compatibility with both live TUI sessions and persisted transcript logs.