v1.3.1 — CSS cache fix & action-specific tooltips

Fixes & improvements

Stale CSS cache fix

The stylesheet <link> carried no version parameter, so after a module upgrade the browser kept serving the previously cached stylesheet — CSS added in v1.2.0/v1.3.0 (lifecycle badge, muted funnel, date subtitles) silently failed to apply. The URL now includes ?v=<file-mtime>, so the stylesheet re-fetches automatically whenever it changes. This also resolves the unstyled "Draft" badge and mis-colored date subtitle.

Action-specific stage tooltips

Reached stages now describe what happened rather than a generic "Completed on …":

• Contact → the actual method, read from the earliest linked event: "Called on …", "Emailed on …", "Met on …", "Faxed on …"
• Proposal → "Proposal sent on …" / "Proposal signed on …"
• Order → "Order placed on …" · Invoice → "Invoiced on …"

en_US + fr_FR translations included.