feat(phase7): per-channel notification settings and read receipts

Phase 7.1 — Per-channel notification settings
- New notification_settings table (user_id, channel_id, level)
- GET/PUT/DELETE handlers under /channels/{channelID}/notifications
- Push dispatch and @mention loops filtered by notification level
- Frontend: bell icon per channel cycling all/mentions/none

Phase 7.4 — Read receipts
- New read_states table (user_id, channel_id, last_read_message_id)
- PUT /channels/{channelID}/read and GET /users/me/read-states
- Auto-mark-read when messages load in ChatArea
- Unread dot for channels never opened

Also: favicon/icon refresh in index.html

cmd/server/main.go

@@ -22,9 +22,11 @@ import (
 	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/message"
 	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/middleware"
 	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/moderation"
+	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/notification"
 	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/permissions"
 	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/push"
 	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/reaction"
+	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/readstate"
 	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/server"
 	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/upload"
 	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/voice"
@@ -212,6 +214,16 @@ func main() {
 				message.NewHandler(database.DB, hub, pushHandler, logger).RegisterRoutes(r)
 			})
 
+			// Per-channel notification settings
+			r.Route("/channels/{channelID}/notifications", func(r chi.Router) {
+				notification.NewHandler(database.DB, logger).RegisterRoutes(r)
+			})
+
+			// Read receipts
+			rsHandler := readstate.NewHandler(database.DB, logger)
+			r.Put("/channels/{channelID}/read", rsHandler.MarkRead)
+			r.Get("/users/me/read-states", rsHandler.GetAll)
+
 			// Giphy search
 			if giphyClient != nil {
 				r.Get("/gifs/search", func(w http.ResponseWriter, r *http.Request) {