feat: Add drawing tools to chart

- Add drawing tools button to chart toolbar
- Implement trend lines, horizontal/vertical lines
- Add arrow markers (up/down)
- Add text labels
- Implement clear all functionality
- Support both desktop and mobile touch events

test.json

@@ -0,0 +1,27 @@
+{
+  "$schema": "https://opencode.ai/theme.json",
+  "theme": {
+    "background": "#09141B",
+    "text": "#DEB88D",
+    "textMuted": "#17384C",
+    "border": "#17384C",
+    "borderActive": "#1BBCDD",
+    "primary": "#FCA02F",
+    "secondary": "#027C9B",
+    "accent": "#68D4F1",
+    "error": "#D15123",
+    "warning": "#FDD39F",
+    "success": "#50A3B5",
+    "info": "#1E4950",
+    "backgroundPanel": "#17384C",
+    "backgroundElement": "#1E4950",
+    "diffAdded": "#628D98",
+    "diffRemoved": "#D48678",
+    "diffContext": "#17384C",
+    "diffHunkHeader": "#434B53",
+    "diffHighlightAdded": "#1BBCDD",
+    "diffHighlightRemoved": "#D48678",
+    "diffAddedBg": "#09141B",
+    "diffRemovedBg": "#09141B"
+  }
+}