Admin Messages: CSV export of the whole filtered list

A right-aligned 'Export CSV ↓' link in the filter row downloads /_gm/messages.csv
with the active filters (game / sender / name / ext masks), exporting every matching
message (capped at 100k) regardless of the page window — columns time, source,
sender_id, sender, ip, message, game_id.

backend/internal/adminconsole/assets/console.css

@@ -74,6 +74,7 @@ h1 { font-size: 1.4rem; margin: 0 0 0.4rem; }
 .subnav a.active { color: var(--ink); }
 
 .form { display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: end; margin-top: 0.4rem; }
+.form .export { margin-left: auto; align-self: center; color: var(--accent); white-space: nowrap; }
 .form.col { flex-direction: column; align-items: stretch; max-width: 540px; }
 .form label { display: flex; flex-direction: column; gap: 0.2rem; font-size: 0.85rem; color: var(--ink-dim); }
 .form input, .form select, .form textarea {

backend/internal/adminconsole/templates/pages/messages.gohtml

@@ -7,6 +7,7 @@
 <input name="name" value="{{.NameMask}}" placeholder="sender name mask (* ?)">
 <input name="ext" value="{{.ExtMask}}" placeholder="sender external id mask (* ?)">
 <button type="submit">Filter</button>
+<a class="export" href="/_gm/messages.csv?{{.FilterQuery}}">Export CSV ↓</a>
 </form>
 {{if or .GameID .UserID}}
 <p class="note">Filtered{{if .GameID}} to game <a href="/_gm/games/{{.GameID}}">{{.GameID}}</a>{{end}}{{if .UserID}} from <a href="/_gm/users/{{.UserID}}">sender</a>{{end}} · <a href="/_gm/messages">clear</a></p>

backend/internal/server/handlers_admin_console.go

@@ -2,6 +2,7 @@ package server
 
 import (
 	"bytes"
+	"encoding/csv"
 	"fmt"
 	"net/http"
 	"net/url"
@@ -53,6 +54,7 @@ func (s *Server) registerConsole(router *gin.Engine) {
 	gm.GET("/complaints/:id", s.consoleComplaintDetail)
 	gm.POST("/complaints/:id/resolve", s.consoleResolveComplaint)
 	gm.GET("/messages", s.consoleMessages)
+	gm.GET("/messages.csv", s.consoleMessagesCSV)
 	gm.GET("/dictionary", s.consoleDictionary)
 	gm.POST("/dictionary/reload", s.consoleReloadDictionary)
 	gm.POST("/dictionary/changes/apply", s.consoleApplyChanges)
@@ -186,6 +188,38 @@ func (s *Server) consoleMessages(c *gin.Context) {
 	s.renderConsole(c, "messages", "messages", "Messages", view)
 }
 
+// adminMessagesExportCap bounds the CSV export row count (the moderated chat volume is small).
+const adminMessagesExportCap = 100000
+
+// consoleMessagesCSV exports the whole filtered chat-message list (ignoring pagination) as a
+// CSV download, for offline moderation review.
+func (s *Server) consoleMessagesCSV(c *gin.Context) {
+	ctx := c.Request.Context()
+	gameID, _ := uuid.Parse(strings.TrimSpace(c.Query("game")))
+	userID, _ := uuid.Parse(strings.TrimSpace(c.Query("user")))
+	filter := social.AdminMessageFilter{
+		GameID:   gameID,
+		SenderID: userID,
+		NameMask: c.Query("name"),
+		ExtMask:  c.Query("ext"),
+	}
+	items, err := s.social.AdminListMessages(ctx, filter, adminMessagesExportCap, 0)
+	if err != nil {
+		s.consoleError(c, err)
+		return
+	}
+	c.Header("Content-Type", "text/csv; charset=utf-8")
+	c.Header("Content-Disposition", `attachment; filename="messages.csv"`)
+	w := csv.NewWriter(c.Writer)
+	_ = w.Write([]string{"time", "source", "sender_id", "sender", "ip", "message", "game_id"})
+	for _, m := range items {
+		_ = w.Write([]string{
+			fmtTime(m.CreatedAt), m.Source, m.SenderID.String(), m.SenderName, m.SenderIP, m.Body, m.GameID.String(),
+		})
+	}
+	w.Flush()
+}
+
 // consoleUserDetail renders one account with its stats, identities and games.
 func (s *Server) consoleUserDetail(c *gin.Context) {
 	ctx := c.Request.Context()