feat(berths): NocoDB-aligned dropdown enums + dual-unit auto-fill

Pull verbatim SingleSelect choices from NocoDB Berths via MCP and lock
them into BERTH_*_OPTIONS / _TYPES in lib/constants.ts: Side Pontoon
(10 values), Mooring Type (5), Cleat Type (2), Cleat Capacity (2),
Bollard Type (2), Bollard Capacity (2), Access (5), Area (A–E), Bow
Facing (4-value UX-only constraint over a SingleLineText). Power
Capacity / Voltage stay numeric inputs (NocoDB stores Number).

Add `toSelectOptions()` mapper for shadcn `<Select>` `{value,label}`
pairs.

Wire every berth dropdown — both the modal form and the inline-edit
detail tabs — to `<Select>`. Inline `EditableSpec` gains
`selectOptions` for the variant and `linkedUnit { field, multiplier }`
to auto-patch the metric column on save (× 0.3048 for ft→m on length,
width, draft, nominal boat size, water depth).

Promote nominal boat size + tenure type from read-only `<SpecRow>` to
`<EditableSpec>` so reps can edit them. Tenure type currently uses the
validator's `'permanent' | 'fixed_term'` set; will swap to per-port
configurable list once Vocabularies admin lands (Wave 5).

Mobile berth cards: replace status-coloured stripe with
`mooringLetterDot()` so it groups by dock letter; status conveyed by
the existing pill below. Berth detail header: "{Letter} Dock" chip
instead of bare "A" / "B" text. Berth area filter: `<Select>` over
A/B/C/D/E (renamed to "Dock"). Documents tab gets a one-paragraph
explainer disambiguating the spec PDF from deal documents (Interests
tab).

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

src/lib/constants.ts

@@ -129,6 +129,8 @@ export type BerthStatus = (typeof BERTH_STATUSES)[number];
 
 export const BERTH_AREAS = ['A', 'B', 'C', 'D', 'E'] as const;
 
+export const BERTH_BOW_FACING_OPTIONS = ['North', 'South', 'East', 'West'] as const;
+
 export const BERTH_SIDE_PONTOON_OPTIONS = [
   'No',
   'Quay SB',
@@ -166,6 +168,13 @@ export const BERTH_ACCESS_OPTIONS = [
   'Car (3.5t) to Vessel',
 ] as const;
 
+/** Helper to map a readonly enum tuple into shadcn `<Select>` `{value,label}` objects. */
+export function toSelectOptions<T extends readonly string[]>(
+  values: T,
+): Array<{ value: T[number]; label: T[number] }> {
+  return values.map((v) => ({ value: v, label: v }));
+}
+
 // ─── Lead Categories ─────────────────────────────────────────────────────────
 
 export const LEAD_CATEGORIES = ['general_interest', 'specific_qualified', 'hot_lead'] as const;