Email search/query + windowed digest preview (v0.1.0:83)

Communications tab (search/query roadmap items 1 & 2):
- Fix the investor dropdown: the facet only listed grid investors, so it
  came back empty whenever email matched a classic contact or org domain
  (no grid id — the common case). It now mirrors the email list, resolving
  each link to a typed identity (fund:/org:/contact:/addr:) with precedence
  grid -> org -> contact -> address; investor_id accepts the typed key
  (bare id = fund: for back-compat) and an unknown prefix matches nothing.
- Add a date-range filter and a click-to-expand full-body view
  (GET /api/email/detail, admin, soft-delete-gated; body_text only, never
  raw remote HTML).
- Add a "Search content" mode: GET /api/email/search wraps the ingest
  hybrid_search over the Qdrant email index (doc_type=email), hydrated and
  soft-delete-filtered against SQLite (canonical), 503 if Spark/Qdrant down.

Daily digest:
- Settings -> Admin builds a digest over a chosen window (last 24h or since
  a date) as an in-app preview before sending (POST /api/admin/digest/preview),
  so the local-Spark summarizer can be verified on demand even on a quiet day.
  Manual send uses the same window; neither advances the daily cursor, so a
  preview never suppresses the scheduled digest.

Code-only, migrations no-op. 22/22 backend tests, render-smoke pass.

start9/0.4/startos/utils.ts

@@ -47,8 +47,9 @@ export const PACKAGE_TITLE = 'Ten31 Database'
 //   * 0.1.0:79 (HOTFIX blank-screen: pin @babel/standalone@7.29.7 — the unpinned CDN upgraded to Babel 8, whose preset-react automatic JSX runtime emits an ESM import that blanks the classic inline-script app; plus close 3 server-side admin gaps: GET /api/users, /api/email/status, /api/email/accounts now require_admin)
 //   * 0.1.0:80 (repurpose Communications tab as the admin-only email-activity panel: new GET /api/email/activity [admin-enforced] over the email_* tables, filterable by investor/mailbox/direction + free-text search; classic manual log form retired; code-only, no schema change)
 //   * 0.1.0:81 (Communications tab is matched-only: query_email_activity gates on EXISTS email_investor_links, so unmatched cold/unknown-sender email is captured but never surfaced in the panel; code-only, no schema change)
-//   * Current:        0.1.0:82 (vendor + SRI-pin the front-end libs: React/ReactDOM/Babel now ship in the s9pk and load same-origin from /assets/vendor/ with integrity hashes, so a CDN can never swap prod deps [the v78/v79 blank-screen class] and the box needs no outbound internet to render; plus a committed jsdom render smoke check [start9/0.4/render-smoke.mjs] gating the default `make` build)
-export const PACKAGE_VERSION = '0.1.0:82'
+//   * 0.1.0:82 (vendor + SRI-pin the front-end libs: React/ReactDOM/Babel now ship in the s9pk and load same-origin from /assets/vendor/ with integrity hashes, so a CDN can never swap prod deps [the v78/v79 blank-screen class] and the box needs no outbound internet to render; plus a committed jsdom render smoke check [start9/0.4/render-smoke.mjs] gating the default `make` build)
+//   * Current:        0.1.0:83 (email search/query + windowed digest preview, code-only: Communications investor dropdown now mirrors the list with typed keys [fund:/org:/contact:] so classic-contact/org-domain matches show + are pickable [fixes the empty-dropdown bug], plus a date-range filter, a click-to-expand full-body view [GET /api/email/detail], and a semantic "Search content" mode over indexed email bodies [GET /api/email/search -> ingest hybrid_search, soft-delete-filtered, 503 if Spark/Qdrant down]; Daily Digest gains an in-app windowed preview before send [POST /api/admin/digest/preview, send-now takes the same window] that exercises the real Spark summarizer without touching the daily cursor)
+export const PACKAGE_VERSION = '0.1.0:83'
 
 export const DATA_MOUNT_PATH = '/data'
 export const WEB_PORT = 8080