Clarify homepage quick start copy

Rewrite homepage install and source sections

Clarify binary launch instructions

Compact install CTA block

Add latest download and Docker CTAs

style(ui): remove heavy hover animation from cards

fix(ui): improve panel observability in light theme and make lobster second

style(ui): clean up theme dropdown text to remove redundant prefixes

feat(ui): implement custom downward dropdown to fix select clipping issue

style(ui): prepend THEME: prefix to theme select options

feat(ui): replace theme cycle button with a select dropdown

style(theme): enhance 8-bit lobster with juicier, more vibrant neon colors

feat(ui): add 8-bit lobster theme

fix(docs): remove dead link to deleted tracker route

fix(docs): finalize link audit by removing orphaned component directories and cleaning up nullclaw hero link