feat: Accumulators markers revamp

[behnam-deriv]

Clickup link:
Fixes issue: #

This PR contains the following changes:

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 📝 Documentation
• 🗑️ Chore

Developers Note (Optional)

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As a creator of this PR:

• ✍️ I have included clickup id and package/app_name in the PR title.
• 👁️ I have gone through the code and removed any temporary changes (commented lines, prints, debug statements etc.).
• ⚒️ I have fixed any errors/warnings shown by the analyzer/linter.
• 📝 I have added documentation, comments and logging wherever required.
• 🧪 I have added necessary tests for these changes.
• 🔎 I have ensured all existing tests are passing.

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• 🪩 The information in this PR properly reflects the code changes.
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• 👌 It passes the acceptance criteria.

Pre-launch Checklist (For Maintainer)

• [MAINTAINER_NAME] I make sure this PR fulfills its purpose.

Summary by Sourcery

Revamp accumulator marker icons by removing previous tick marker support and simplifying barrier drawing

Enhancements:

• Remove previousTick parameter and related handling from AccumulatorMarkerIconPainter
• Simplify barrier circle rendering to use only the barrier color
• Delete previousTick enum entry from MarkerType

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Refactors the accumulator marker icon painter by removing the previous tick barrier feature and cleaning up related parameters and enum definitions.

Class diagram for refactored AccumulatorMarkerIconPainter and ChartMarker

classDiagram
class AccumulatorMarkerIconPainter {
  +paintMarkers()
  -_drawPreviousTickBarrier(size, canvas, startX, endX, y, barrierColor)
}
class TickMarkerIconPainter
AccumulatorMarkerIconPainter --|> TickMarkerIconPainter
class ChartMarker
class MarkerType
MarkerType : latestTick
MarkerType : highBarrier
MarkerType : lowBarrier
MarkerType : exitSpot
MarkerType : tick

%% Removed enum value
%% MarkerType : previousTick (removed)

Loading

File-Level Changes

Change	Details	Files
Remove previousTick marker handling and related drawing logic	Eliminate retrieval of previousTickMarker from markers map Remove previousTickMarker parameter from internal draw function Replace conditional draw logic with unconditional barrier draw using barrierColor Delete circle drawing code for previous tick barrier Update function call signature to reflect removed parameter	lib/src/deriv_chart/chart/data_visualization/markers/marker_icon_painters/accumulator_marker_icon_painter.dart
Purge previousTick enum entry from MarkerType	Delete previousTick value and its documentation in MarkerType enum	lib/src/deriv_chart/chart/data_visualization/markers/chart_marker.dart

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[sourcery-ai]

Hey there - I've reviewed your changes - here's some feedback:

• Since the previousTick marker was fully removed, make sure to clean up or update any remaining references to MarkerType.previousTick elsewhere in the codebase for consistency.
• The accumulator painter’s paint method still handles multiple drawing responsibilities—consider extracting the barrier and shape rendering into smaller helper methods for better readability and testability.
• Now that _drawPreviousTickBarrier only uses a single color, rename the method or its parameters to reflect that it’s no longer tied to a distinct ‘previous tick’ color for clarity.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Since the previousTick marker was fully removed, make sure to clean up or update any remaining references to MarkerType.previousTick elsewhere in the codebase for consistency.
- The accumulator painter’s paint method still handles multiple drawing responsibilities—consider extracting the barrier and shape rendering into smaller helper methods for better readability and testability.
- Now that _drawPreviousTickBarrier only uses a single color, rename the method or its parameters to reflect that it’s no longer tied to a distinct ‘previous tick’ color for clarity.

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