fix(icon): render non-path SVG primitives and preserve stroke caps/joins

[AsimNet]

Summary

Fixes two related bugs that cause several icons to render incorrectly when used via <hugeicons-icon>. Closes #5.

Bug 1 — Non-path SVG elements rendered as empty <path>

paths() only extracts d / fill / opacity / fillRule and the template renders every entry as <path>. But many icons contain circle, ellipse, rect, line, polyline, or polygon — these have no d attribute, so they collapse to empty <path d=""> tags and disappear.

Examples affected: CompassIcon (outer circle), AlertCircleIcon (outer circle + dots), MapsLocation01Icon (inner pin dot).

Bug 2 — strokeLinecap / strokeLinejoin stripped

Even for icons that only contain <path> elements, near-zero-length paths require stroke-linecap: round to render. The current code drops both attributes, so dots in icons like Alert02Icon (the exclamation dot is M11.992 16H12.001) become invisible — default linecap: butt collapses them to nothing.

Approach

• Add an elementToPathD(tag, attrs) helper that converts each non-path SVG primitive into an equivalent path d string (circle, ellipse, rect, line, polyline, polygon).
• Preserve strokeLinecap and strokeLinejoin from the source attrs, defaulting both to round when missing.
• Bind the two new attributes in the template.

The template still renders a single <path> — no DOM-shape change, no breaking API change. Default round linecap/linejoin matches how the icons are rendered on hugeicons.com.

Why this approach over native <circle>/<ellipse> rendering

A few previous comments on #5 suggested using @switch to render native SVG tags. That's also valid but bloats the template significantly and changes the DOM structure. Converting to path data is a smaller surface change and preserves the existing rendering pipeline 1:1 — fewer chances of regressions.

Test plan

• pnpm build passes (verified locally)
• Visual diff on CompassIcon: outer circle now renders
• Visual diff on AlertCircleIcon: outer circle + dots render
• Visual diff on MapsLocation01Icon: inner pin dot renders
• No change to icons that only contained <path> elements with non-zero-length paths
• CI runs (the repo doesn't appear to have one wired up — let me know if I should add one)

Verified on

Angular 19, @hugeicons/angular@1.0.7 source, @hugeicons-pro/core-stroke-rounded icon pack.