feat(medications): an api tab, a stockable inventory and a next-due that tells the truth

The detail page gains a dedicated API tab, the full-edit button becomes
a lifecycle row that opens the editor, the danger zone drops its red
wash in favour of the shared card chrome, and the card menu's edit
entry leads to the detail page it describes. The inventory tab finally
records stock — packs and pens with optional expiry, plus corrections —
instead of pointing at an API. The card's next-dose line reads from the
canonical band model instead of a stale schedule window, which also
showed old dose times after a schedule change; the repair script learns
to reconcile drifted windows and tombstone pending rows parked on
abandoned anchors.

src/lib/validations/medication.ts

@@ -803,6 +803,13 @@ export const updateInventoryItemSchema = z.object({
     .transform((s) => new Date(s))
     .nullable()
     .optional(),
+  /**
+   * v1.16.1 — stock correction (the Bestand tab's adjust / withdraw
+   * flow). Sets the remaining-dose count directly; the route clamps to
+   * `dosesTotal` and re-runs the canonical state machine (0 ⇒ USED_UP,
+   * a raise out of 0 re-evaluates against the expiry clocks).
+   */
+  dosesRemaining: z.number().int().min(0).max(100).optional(),
   notes: z.string().max(200).nullable().optional(),
 });