feat(uat-batch): Group C Berth list features (3 new ships + 1 verified)

C20–C23 from the 2026-05-21 plan.

Shipped now:
  C21  Dimensions ft/m column toggle persisted to user prefs.
       `TablePreferences.dimensionUnit` ('ft' | 'm') added to the user-
       profiles JSONB. `useTablePreferences` returns `dimensionUnit` +
       `setDimensionUnit` alongside hidden/density. New
       `getBerthColumns(unit)` factory rewrites the dimensions /
       nominalBoatSize / waterDepth cells when ft is requested
       (waterDepth converts on-the-fly from the canonical meters
       column at 3.2808 ft/m). Berth-list toolbar gains a small
       ft/m toggle button next to the density toggle.
  C22  ft/m switching on Berth Requirements rows.
       `interest-tabs.tsx` Berth-requirements section now honours
       `interest.desiredLengthUnit`. Labels flip to "(m)" when set;
       value reads from `desired*M` columns; on save, both the chosen-
       unit and the canonical counterpart columns are PATCHed (3.28084
       ratio) so downstream surfaces (recommender, EOI merge fields)
       stay in lockstep. `InterestPatchField` widened with `desired*M`
       variants.
  C23  Berth list bulk-edit affordance.
       New `POST /api/v1/berths/bulk` (mirror of /interests/bulk):
       discriminated union of `change_status` / `change_tenure_type` /
       `add_tag` / `remove_tag` / `archive`, 500-id cap, per-row
       failure reporting, single `berths.edit` permission gate
       (no separate `archive` perm exists on berths today). Status
       mutations route through `updateBerthStatus` so under-offer /
       sold transitions still trigger the primary interest_berths
       auto-link + the rules-engine evaluation.
       BerthList toolbar wires `bulkActions` on the DataTable —
       Change status (Select dialog), Change tenure (permanent /
       fixed-term), Add tag, Remove tag, Archive (destructive +
       confirmation). Each dialog uses the same `bulkMutation` so
       toast + cache-invalidation behaviour is consistent across
       actions.

Already shipped (verified):
  C20  Berth list rates / pricing valid columns hidden by default —
       already in `BERTH_DEFAULT_HIDDEN`.

Verified: tsc clean, vitest 1454/1454.

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

src/lib/db/schema/users.ts

@@ -178,6 +178,11 @@ export type TablePreferences = {
    *  default cell padding). 'compact' drops vertical padding so reps
    *  can scan more rows per viewport. */
   density?: 'comfortable' | 'compact';
+  /** Dimension unit preference for tables that render boat / berth
+   *  measurements. Absent = inferred from the user's locale; 'ft' for
+   *  US/UK defaults, 'm' elsewhere. Per-table override via the column
+   *  header toggle. */
+  dimensionUnit?: 'ft' | 'm';
 };
 
 export type UserPreferences = {