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/state/catalogStore.ts

@@ -1,7 +1,9 @@
 import { create } from 'zustand'
 import type { CableType, Catalog, DeviceTemplate, PortType } from '../domain/types'
 import type { CatalogRepository } from '../data/CatalogRepository'
+import { cableTypeToRow, deviceTemplateToRow, portTypeToRow } from '../data/catalogRowMapping'
 import { SupabaseCatalogRepository } from '../data/SupabaseCatalogRepository'
+import { useSubmissionStore } from './submissionStore'
 
 const repository: CatalogRepository = new SupabaseCatalogRepository()
 
@@ -80,6 +82,8 @@ export const useCatalogStore = create<CatalogStoreState>((set, get) => ({
         portTypes: state.catalog.portTypes.map((pt) => (pt.id === id ? { ...pt, ...patch } : pt)),
       },
     }))
+    const updated = get().catalog.portTypes.find((pt) => pt.id === id)
+    if (updated) useSubmissionStore.getState().syncProposedData('port_type', id, portTypeToRow(updated))
   },
 
   addCustomCableType: async (cableType) => {
@@ -95,6 +99,8 @@ export const useCatalogStore = create<CatalogStoreState>((set, get) => ({
         cableTypes: state.catalog.cableTypes.map((ct) => (ct.id === id ? { ...ct, ...patch } : ct)),
       },
     }))
+    const updated = get().catalog.cableTypes.find((ct) => ct.id === id)
+    if (updated) useSubmissionStore.getState().syncProposedData('cable_type', id, cableTypeToRow(updated))
   },
 
   addCustomDeviceTemplate: async (template) => {
@@ -110,6 +116,8 @@ export const useCatalogStore = create<CatalogStoreState>((set, get) => ({
         deviceTemplates: state.catalog.deviceTemplates.map((t) => (t.id === id ? { ...t, ...patch } : t)),
       },
     }))
+    const updated = get().catalog.deviceTemplates.find((t) => t.id === id)
+    if (updated) useSubmissionStore.getState().syncProposedData('device_template', id, deviceTemplateToRow(updated))
   },
 
   removeCustomDeviceTemplate: async (id) => {