v0.1.4

Styling pass on the popover:

• Border derives from the text color (30% mix) instead of Bootstrap's stock gray, which disappeared against themes with a nearby background; the box also gets an elevation shadow.
• Preview text rides tippy's 0.875rem instead of shrinking a further 15%.
• Banner title blocks bleed to the popover edges with their own internal padding, fixing title text sitting flush against the color boundary (0.1.3 regression). Grid flatten now uses !important — Quarto's body-class grid selectors out-specify preview-scoped rules.
• New styling hooks on :root: --link-preview-font-size, --link-preview-border-color, --link-preview-shadow.