Location Notes (kind 1) at Building Precision + Live Updates (#598)

* Location notes: Matrix loader with 1–3s minimum display; allow multiple notes; wire notes UI from mesh toolbar

* Location notes: prevent duplicate loading/subscriptions (StateObject manager, geohash captured at open, guard subscribe)

* Location notes: fix duplicate  state redeclaration in ContentView

* Location notes: render note bodies with monospaced font in notes list

* Location notes: add close (x) button in sheet header (upper-right) using @Environment(\.dismiss)

* Location notes: acquire geohash on open (force refresh) and show Matrix loader until block-level geohash resolves; add LocationNotesSheet wrapper

* Location notes: inline sheet wrapper to avoid missing file in target; force location refresh and show Matrix loader until block geohash resolves

* Location notes: remove Matrix animation; use simple spinner when acquiring location; simplify notes view layout

* Location notes: remove per-note relative timestamp from sheet (no seconds display)

* Location notes: fix intermittent first load by ensuring resubscribe after geohash change, removing over-eager subscribe guard, and widening note fetch window (no since filter)

* Location notes: add background counter service and show count next to notes icon on mesh; auto-subscribe to current block geohash

* Location notes: move notes icon to the right of #mesh badge in toolbar

* Location notes: restore timestamps in notes list; remove loading state from manager and sheet (no spinner/animation)

* Location notes: drop 'teleport' tag from kind-1 events; simplify note builder API and usage

* Location notes: show timestamp as relative within 7 days, else absolute date (MMM d or MMM d, y); keep monospaced styling

* Location notes: append 'ago' to relative timestamps (within 7 days)

* Switch location notes and UI helpers to building-level geohash (precision 8): add GeohashChannelLevel.building, map length 8, use building for notes selection and counter, add building name mapping

* Location notes: change notes toolbar icon to SF Symbol 'long.text.page.and.pencil'

* Revert notes geohash selection back to block-level (precision 7); keep building level available but unused; update counter and sheet accordingly

* Location notes: show block name (from reverse geocode) in header instead of 'street-level notes'

* Nostr: add EOSE handling with callback support for subscriptions; wire to LocationNotesManager/Counter (initialLoadComplete). Remove 'building' level from channel enum and geocoder mapping; geohash list shows block/neighborhood/city/province/region only

* Fix Swift 6 isolation: hop to @MainActor inside Timer callback for EOSE tracker mutations

* Notes counter: show 0 by default; subscribe at building-level (precision 8) for notes and counter; keep building hidden in channel list

* Notes header: show building name when available (fallback to block name)

* Notes: subscribe counter to building + parent block (merge results); hide notes icon unless location is authorized; replace 10s timer with live location updates while sheet open

* Notes counter: subscribe only to building geohash (precision 8) so count reflects current 8-cell; auto-begin live location refresh on mesh (and permission) to update as you walk

* Notes header: show count in parentheses; icon shows blue if any notes, grey if none; only start live location updates while sheet is open; reduce nickname width; set live distance filter to 10m

* Notes header: show count as '(N note/notes)' with non-bold, secondary styling next to title

* Notes header: move count before title as '<N> note(s) @ #gh'; remove parentheses; keep count non-bold

* Notes header: bold count text; ensure sheet updates when building geohash changes by calling manager.setGeohash on geohash change

* Notes sheet: add light haptic feedback when building geohash changes (iOS only)

* Notes icon: force a one-shot location refresh before (re)subscribing the counter so icon turns blue immediately on current 8-cell

* Notes subscribe: fallback to default relays when GeoRelayDirectory has no entries (pass nil relayUrls) so counter/icon turn blue and sheet loads even before georelay fetch

* Notes icon: turn blue immediately when sheet shows notes by passing count up from sheet (closure) and OR-ing with counter; reset on sheet close

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Co-authored-by: jack <jackjackbits@users.noreply.github.com>

bitchat/Nostr/NostrProtocol.swift

@@ -123,6 +123,28 @@ struct NostrProtocol {
         let schnorrKey = try senderIdentity.schnorrSigningKey()
         return try event.sign(with: schnorrKey)
     }
+
+    /// Create a persistent location note (kind 1: text note) tagged to a street-level geohash.
+    static func createGeohashTextNote(
+        content: String,
+        geohash: String,
+        senderIdentity: NostrIdentity,
+        nickname: String? = nil
+    ) throws -> NostrEvent {
+        var tags = [["g", geohash]]
+        if let nickname = nickname?.trimmingCharacters(in: .whitespacesAndNewlines), !nickname.isEmpty {
+            tags.append(["n", nickname])
+        }
+        let event = NostrEvent(
+            pubkey: senderIdentity.publicKeyHex,
+            createdAt: Date(),
+            kind: .textNote,
+            tags: tags,
+            content: content
+        )
+        let schnorrKey = try senderIdentity.schnorrSigningKey()
+        return try event.sign(with: schnorrKey)
+    }
     
     // MARK: - Private Methods