SVG Favicon to PNG Conversion

What Was Built

SVG favicons discovered during the favicon fetch pipeline are now automatically converted to 64x64 PNG images using MiniMagick before being attached via Active Storage. The conversion is optional -- host apps without the mini_magick gem or ImageMagick installed will gracefully skip SVG favicons and fall through to the next candidate in the discovery cascade. A new SvgConverter class handles the conversion with full error isolation.

Tasks Completed

• Task 1: Add mini_magick dependency (commit: 72e1b1a)
• Task 2: Add SVG-to-PNG conversion in favicon pipeline (commit: 81d057d)
• Task 3: Test SVG favicon flow end-to-end (commits: d7fd049, f3a2d7d)

Files Modified

• Gemfile — added mini_magick to test group
• Gemfile.lock — updated lockfile
• lib/source_monitor.rb — added SvgConverter autoload
• lib/source_monitor/favicons/svg_converter.rb — new SVG-to-PNG converter using MiniMagick
• lib/source_monitor/favicons/discoverer.rb — integrated SVG detection and conversion in download_favicon
• test/lib/source_monitor/favicons/svg_converter_test.rb — new unit tests for SvgConverter
• test/lib/source_monitor/favicons/discoverer_test.rb — added SVG conversion integration tests

Deviations

• mini_magick added to Gemfile test group instead of gemspec runtime dependency, making it optional for host apps. The SvgConverter uses a defined?(MiniMagick) guard to fail gracefully when the gem is not installed.

Test Results

• 1232 runs, 3813 assertions, 0 failures, 0 errors, 0 skips
• RuboCop: 0 offenses on changed files
• 7 new tests added (4 SvgConverter unit tests, 3 Discoverer integration tests)