Add the user-submission flow for the catalog

Lets users submit a private catalog entry (port type, cable type, device
template) for promotion to the public catalog, or suggest an edit to an
existing public entry — both go into the catalog_submissions review queue
per organized-ideas.md §3. No Admin review UI yet (next sub-phase); this
covers the submitter's side only.

- data/SubmissionRepository + SupabaseSubmissionRepository: submit,
  resubmit, withdraw, list-mine, backed by the existing catalog_submissions
  RLS policies (no schema changes needed).
- data/catalogRowMapping.ts: shared domain<->row mappers, in both
  directions, so a submission's proposed_data is always shaped like the
  underlying table row (what an eventual admin-approval would write
  directly) and can be turned back into form-editable fields for revision.
- state/submissionStore.ts: mySubmissions + submit/resubmit/withdraw, plus
  syncProposedData — called from catalogStore's updateCustom* actions so a
  submission about your own still-private entry never goes stale relative
  to it (edits from the library and from My Submissions are the same
  action and always agree).
- UI: "Submit"/"Suggest edit" wired into PortTypeManager, CableTypeManager,
  DevicePalette/DeviceTemplateEditor; new MySubmissionsModal (opened from
  TopBar, with a pending-count badge) shows status, rejection reasons, and
  lets you edit/resubmit or withdraw.
- Deliberately deferred: device_category submissions (no listing UI to
  hang a button on yet) and the normalized manufacturer catalog.

Verified: tsc -b and oxlint clean; supabase db reset + 23/23 pgTAP RLS
tests still pass (no schema changes this round); manually tested submit,
suggest-edit, edit-from-either-side sync, reject/resubmit, and withdraw.

src/components/palette/DeviceTemplateEditor.tsx

@@ -1,8 +1,10 @@
 import { useMemo, useState } from 'react'
+import { deviceTemplateToRow } from '../../data/catalogRowMapping'
 import { PORT_CATEGORIES, PORT_DIRECTIONS } from '../../domain/constants'
 import { allPortTypes, expandCompatibleFamilyIds, incrementPortName } from '../../domain/project'
 import type { DeviceTemplate, PortDirection } from '../../domain/types'
 import { useCatalogStore } from '../../state/catalogStore'
+import { useSubmissionStore } from '../../state/submissionStore'
 import CategorySelect from '../common/CategorySelect'
 import Modal from '../common/Modal'
 
@@ -21,11 +23,22 @@ function nextDraftKey() {
 
 export default function DeviceTemplateEditor({
   template,
+  submissionMode = false,
+  resubmitId,
   onClose,
   onSaved,
 }: {
-  /** When set, edits this existing custom template instead of creating a new one. */
+  /** When set, edits/prefills from this existing template instead of creating a new one. */
   template?: DeviceTemplate
+  /** When true, `template` is a public entry you don't own — saving submits
+   *  a suggested edit for Admin review instead of mutating it directly
+   *  (which RLS wouldn't allow anyway). */
+  submissionMode?: boolean
+  /** When set, saving revises this existing submission (of your own,
+   *  pending or rejected) instead of creating a new one — see
+   *  MySubmissionsModal's "Edit & resubmit". Takes precedence over
+   *  `submissionMode` if both are somehow set. */
+  resubmitId?: string
   onClose: () => void
   /** Called with the template's category id right before closing, so the
    *  palette can expand that category and reveal what was just created/edited. */
@@ -35,6 +48,8 @@ export default function DeviceTemplateEditor({
   const addCustomDeviceTemplate = useCatalogStore((s) => s.addCustomDeviceTemplate)
   const updateCustomDeviceTemplate = useCatalogStore((s) => s.updateCustomDeviceTemplate)
   const addCustomPortType = useCatalogStore((s) => s.addCustomPortType)
+  const submitForReview = useSubmissionStore((s) => s.submitForReview)
+  const resubmit = useSubmissionStore((s) => s.resubmit)
 
   const portTypes = useMemo(
     () => [...allPortTypes(catalog)].sort((a, b) => a.name.localeCompare(b.name)),
@@ -124,7 +139,11 @@ export default function DeviceTemplateEditor({
       cost: cost.trim() === '' ? undefined : Number(cost),
       ports: ports.map((p) => ({ id: p.key, name: p.name.trim() || 'Port', direction: p.direction, portTypeId: p.portTypeId })),
     }
-    if (template) {
+    if (resubmitId) {
+      resubmit(resubmitId, deviceTemplateToRow(fields))
+    } else if (submissionMode && template) {
+      submitForReview('device_template', template.id, deviceTemplateToRow(fields))
+    } else if (template) {
       updateCustomDeviceTemplate(template.id, fields)
     } else {
       addCustomDeviceTemplate(fields)
@@ -134,7 +153,11 @@ export default function DeviceTemplateEditor({
   }
 
   return (
-    <Modal title={template ? 'Edit Custom Device' : 'New Custom Device'} onClose={onClose} width="max-w-xl">
+    <Modal
+      title={resubmitId ? 'Revise Submission' : submissionMode ? 'Suggest an Edit' : template ? 'Edit Custom Device' : 'New Custom Device'}
+      onClose={onClose}
+      width="max-w-xl"
+    >
       <div className="space-y-3">
         <div className="grid grid-cols-2 gap-3">
           <label className="col-span-2 text-xs font-medium text-slate-600">
@@ -327,7 +350,7 @@ export default function DeviceTemplateEditor({
             disabled={!canSave}
             className="rounded bg-indigo-600 px-3 py-1.5 text-xs font-medium text-white hover:bg-indigo-500 disabled:cursor-not-allowed disabled:opacity-40"
           >
-            {template ? 'Save changes' : 'Save device'}
+            {resubmitId ? 'Resubmit' : submissionMode ? 'Submit for review' : template ? 'Save changes' : 'Save device'}
           </button>
         </div>
       </div>