feat(rotation): per-device image-selection preferences

Adds two settings exposed in the PWA frame-settings sheet:

- rotationMode (enum: random | least_recently_shown | oldest_upload |
  newest_upload). Default oldest_upload preserves the legacy
  hard-coded sort, so existing devices behave identically until the
  user changes it.
- prioritizeNeverShown (bool). When set, the candidate set is narrowed
  to never-shown images first (if any exist) before the mode runs —
  useful for "burn through new uploads before re-shuffling the catalog."

RotationService pipeline:
  1. Pull approved/ready pool.
  2. Drop the last `uniquenessWindow` served (existing).
  3. If prioritizeNeverShown AND any candidates have never been served,
     narrow to those.
  4. Apply the selection mode.

Backend: enum, entity columns + accessors, migration, serializer,
PATCH validator. Frontend: types, stores, settings sheet section
(dropdown + checkbox), test fixtures, save-flow test.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

public/build/assets/DevicePicker-B4STV2u_.js

@@ -0,0 +1 @@
+import{_ as e,d as t,f as n,g as r,j as i,k as a,m as o,pt as s,s as c,t as l,u,v as d,z as f}from"./_plugin-vue_export-helper-DRLwVS0w.js";import{n as p,t as m}from"./BaseBottomSheet-CHak0WUZ.js";var h={class:`device-picker__list`},g=[`checked`,`onChange`],_={class:`device-picker__name`},v={class:`device-picker__orientation`},y=l(d({__name:`DevicePicker`,props:{modelValue:{type:Boolean},devices:{},selected:{},uploading:{type:Boolean}},emits:[`update:modelValue`,`update:selected`,`confirm`],setup(l,{emit:d}){let y=l,b=d;function x(e){y.selected.includes(e)?b(`update:selected`,y.selected.filter(t=>t!==e)):b(`update:selected`,[...y.selected,e])}let S=u(()=>{let e=y.selected.length;return e===0?`Add to frame`:`Add to ${e} frame${e>1?`s`:``}`});return(u,d)=>(a(),n(m,{"model-value":l.modelValue,label:`Choose frames`,"onUpdate:modelValue":d[1]||=e=>u.$emit(`update:modelValue`,e)},{default:f(()=>[d[2]||=t(`h2`,{class:`device-picker__title`},`Add to frames`,-1),d[3]||=t(`p`,{class:`device-picker__sub`},`Choose which frames will show this photo.`,-1),t(`div`,h,[(a(!0),o(c,null,i(l.devices,e=>(a(),o(`label`,{key:e.id,class:`device-picker__row`},[t(`input`,{type:`checkbox`,class:`device-picker__check`,checked:l.selected.includes(e.id),onChange:t=>x(e.id)},null,40,g),t(`span`,_,s(e.name),1),t(`span`,v,s(e.orientation),1)]))),128))]),e(p,{variant:`primary`,class:`device-picker__confirm`,disabled:l.selected.length===0||l.uploading,onClick:d[0]||=e=>u.$emit(`confirm`)},{default:f(()=>[r(s(l.uploading?`Uploading…`:S.value),1)]),_:1},8,[`disabled`])]),_:1},8,[`model-value`]))}}),[[`__scopeId`,`data-v-a6466fa5`]]);export{y as t};