927ac2be53
Pure UX bundle from the testing batch. None individually changes behavior; together they remove a half-dozen sharp edges. 1. Policy-list duration column: human-readable `31536000s` / `604800s` / `0s` are now `1 year` / `1 week` / `perpetual`. New `fmtDuration()` helper handles common cadences (1 day, 1 week, 1 month, 3 months, 6 months, 1 year, 2 years) with arithmetic fallbacks for non-canonical values. Grace column gets the same treatment with "none" for 0. 2. "Preview buy page" button per product header The Policies tab's per-product card now has a "Preview buy page" button on the right side of the header (when ≥ 1 public+active policy exists). Opens /buy/<slug> in a new tab. tableCard() helper grew an optional headerAction param. 3. Buy page tier card: "Select" → "Selected" When a tier becomes the active selection, its button label flips to "Selected" while other tiers' buttons stay "Select". Combined with the existing .selected card-border styling gives buyers an unambiguous "yes, this tier is what's tied to the price card below" cue. 4. Licenses page POLICY column shows display name Was showing slug (`recurring`, `core`, `creator`); now shows the operator-set display name (Recurring Pro, Core, Creator) primary, with the slug as a smaller mono-font line below. Operators see what the buyer sees while keeping the slug visible for SDK reference. (Subscriptions tab already handled this pattern; this brings Licenses in line.) 5. Change Tier dropdown: "(current)" annotation Current tier now appears in the dropdown but with " · current" appended and `disabled` attribute set. Operator sees what they're starting from but can't pick the no-op. Auto-selects the first SELECTABLE option so the modal opens with a valid target ready. formSelect() helper grew per-option `disabled` support. 6. Single "Switch active payment provider" StartOS action The two old "Activate BTCPay" / "Activate Zaprite" actions collapsed into one dropdown-driven action. Operators saw the pair as confusing — both appeared alongside Connect / Disconnect / Status, and operators couldn't tell at a glance which one was currently active. New action pre-fills the dropdown with the currently-active provider so opening it is immediately informative. Old action ids retained as visibility:'hidden' shims for back-compat with any operator scripts pointing at them. Test count unchanged; UI-only changes don't touch any test fixtures.