demo links, UI layout update — artlu.ai

two small fixes to the project table that had been bothering for a while.

the first was a logic gap in Links.jsx. projects with an embedded artifact (raw html stored directly in firestore) were showing a dash in the links column instead of ▶ demo. the component only checked for a media url — it didn't know about artifactHtml. fix was one new condition: if artifactHtml is set, render a ▶ demo button that expands the row. no new wiring needed — ProjectDetail already defaults to the demo tab when an embed exists, so clicking it just falls through to the existing expand behavior.

the second was column widths. the links column was taking up horizontal space it didn't need, which compressed the title column. the fix: width 1% on the status, stack, date, and links headers. that's a css table trick — 1% tells the browser to shrink those columns to their content, leaving all remaining space to the project title column. also changed the link label from the full hostname to just "site ↗" — shorter, consistent, and actually what rules.md specified all along. stack column got a minWidth floor so it doesn't over-wrap on long tech stacks.

two files changed, four lines of code.