feat: Add drawing tools to chart

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- 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

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DiTus

2026-03-21 09:41:58 +01:00

parent 96edde8f81

commit a34f80f841

4 changed files with 403 additions and 7 deletions

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