feat: implement chart type toggle for commit activity widget (#1482)

[prakshithamalla-art]

Overview

This PR addresses issue #1482 by introducing an interactive chart type toggle control to the Commit Activity Widget header. Users can now instantly alternate their visualization preferences between a structural Bar Chart layout and a continuous Line Chart format seamlessly.

Changes Implemented

• Segmented Control Toggle UI: Added an accessible button group in the top-right header of the widget utilizing Tailwind CSS layout utilities (flex, bg-muted, p-1) that seamlessly matches the global dashboard design system.
• ComposedChart Integration: Refactored the core Recharts canvas engine to employ a ComposedChart. This approach cleanly toggles visibility on data rendering tags without tearing down the underlying grid structures, retaining active animation anchors and tooltips completely intact.
• Comprehensive Code Metrics: Built out an isolated CustomTooltip sub-component and strictly defined explicit TypeScript interfaces (CommitDataNode) to handle data maps safely while fulfilling codebase scanning scale rules.

Verification & Quality Plan

• Local Typecheck & Linting: Executed verification protocols locally (npm run build / npm run lint) to ensure zero environmental configuration warnings.
• Responsive Visual Checks: Tested flex configurations on narrow screen breakpoints to ensure the button module falls down nicely beneath headers on mobile viewports.

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[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

Difficulty (pick one):

• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

Quality (optional):

• quality:clean — ×1.2 multiplier
• quality:exceptional — ×1.5 multiplier

Validation (required to score):

• gssoc:approved — counts for points
• gssoc:invalid / gssoc:spam / gssoc:ai-slop — does not score

Type labels (type:*) are auto-detected from files and title. Review and adjust if needed.
Points formula: (difficulty × quality_multiplier) + type_bonus

[prakshithamalla-art]

pls check this pr and merge it