refactor: remove line-deletion capability (already implemented)

Line deletion via Delete tool already exists in current implementation.
Focus on three new capabilities: label-management, docker-deployment, hacker-theme

openspec/changes/enhance-annotation-features-and-deployment/proposal.md

@@ -4,10 +4,6 @@ The candle annotator currently has basic line drawing functionality (Phase 1-4 c
 
 ## What Changes
 
-### Line Management Enhancements
-- **Delete Selected Line**: Add ability to delete the currently selected line using keyboard shortcut (Delete/Backspace key)
-- **Delete All Lines**: Add button in Toolbox to clear all line annotations at once with confirmation dialog
-
 ### Label Management System
 - **Delete All Labels**: Add button to remove all break_up/break_down markers with confirmation
 - **Select Label**: Make label markers (arrows) clickable to select/highlight them
@@ -43,7 +39,6 @@ The candle annotator currently has basic line drawing functionality (Phase 1-4 c
 ## Capabilities
 
 ### New Capabilities
-- `line-deletion`: Delete selected line or all lines at once
 - `label-management`: Complete CRUD interface for label annotations in sidebar
 - `docker-deployment`: Containerized deployment with docker-compose
 - `hacker-theme`: Terminal-inspired minimal dark theme with neon accents
@@ -56,7 +51,6 @@ The candle annotator currently has basic line drawing functionality (Phase 1-4 c
 ### Code Changes
 - **Database**: No schema changes needed (existing tables support all operations)
 - **Components**:
-  - `SvgOverlay.tsx`: Add keyboard delete handlers, bulk delete logic
   - `Toolbox.tsx`: Add label list UI, delete buttons, collapsible sections, theme styling
   - `CandleChart.tsx`: Add label selection click handlers, highlight logic
   - `page.tsx`: Add state for selected label, pass callbacks