1.0.19

Fix Hacker News tab icon and add comments link (#37)

* Add Hacker News as a new source tab

Adds a source-hackernews module that fetches HN front-page stories via
the public Algolia HN Search API, wired into the services DI graph and
sources.json alongside the existing Github/Medium/Weekly sources so it
shows up as its own tab.

* Fix Release APK workflow: bump deprecated GitHub Actions to v4

actions/upload-artifact@v3 is deprecated and now auto-fails CI runs;
also bumps actions/checkout and actions/setup-java to v4 for consistency.

* Fix Hacker News tab icon and add comments link

The tab icon was a two-color vector (orange square + white Y), but tab
icons are tinted via app:tint on the ImageView, which recolors the
whole drawable using a single color and turned it into a solid block.
Replace it with a single-path monochrome glyph like the other tabs.

Also surface the HN discussion thread: ServiceItem gains an optional
commentsUrl, populated for Hacker News items with the story's
news.ycombinator.com link and its comment count in the footer text. A
new comments icon next to the bookmark button opens that link via the
existing child-click-listener plumbing, without touching the primary
tap target (which still opens the story's article).

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Co-authored-by: Claude <noreply@anthropic.com>