fix(discord): land proxy/media/reaction/model-picker regressions

Reimplements core Discord fixes from #25277 #25523 #25575 #25588 #25731 with expanded tests.

- thread proxy-aware fetch into inbound attachment/sticker downloads
- fetch /gateway/bot via proxy dispatcher before ws connect
- wire statusReactions emojis/timing overrides into controller
- compact model-picker custom_id keys with backward-compatible parsing

Co-authored-by: openperf <openperf@users.noreply.github.com>
Co-authored-by: chilu18 <chilu18@users.noreply.github.com>
Co-authored-by: Yipsh <Yipsh@users.noreply.github.com>
Co-authored-by: lbo728 <lbo728@users.noreply.github.com>
Co-authored-by: s1korrrr <s1korrrr@users.noreply.github.com>

src/discord/monitor/message-utils.ts

@@ -2,7 +2,7 @@ import type { ChannelType, Client, Message } from "@buape/carbon";
 import { StickerFormatType, type APIAttachment, type APIStickerItem } from "discord-api-types/v10";
 import { buildMediaPayload } from "../../channels/plugins/media-payload.js";
 import { logVerbose } from "../../globals.js";
-import { fetchRemoteMedia } from "../../media/fetch.js";
+import { fetchRemoteMedia, type FetchLike } from "../../media/fetch.js";
 import { saveMediaBuffer } from "../../media/store.js";
 
 export type DiscordMediaInfo = {
@@ -161,6 +161,7 @@ export function hasDiscordMessageStickers(message: Message): boolean {
 export async function resolveMediaList(
   message: Message,
   maxBytes: number,
+  fetchImpl?: FetchLike,
 ): Promise<DiscordMediaInfo[]> {
   const out: DiscordMediaInfo[] = [];
   await appendResolvedMediaFromAttachments({
@@ -168,12 +169,14 @@ export async function resolveMediaList(
     maxBytes,
     out,
     errorPrefix: "discord: failed to download attachment",
+    fetchImpl,
   });
   await appendResolvedMediaFromStickers({
     stickers: resolveDiscordMessageStickers(message),
     maxBytes,
     out,
     errorPrefix: "discord: failed to download sticker",
+    fetchImpl,
   });
   return out;
 }
@@ -181,6 +184,7 @@ export async function resolveMediaList(
 export async function resolveForwardedMediaList(
   message: Message,
   maxBytes: number,
+  fetchImpl?: FetchLike,
 ): Promise<DiscordMediaInfo[]> {
   const snapshots = resolveDiscordMessageSnapshots(message);
   if (snapshots.length === 0) {
@@ -193,12 +197,14 @@ export async function resolveForwardedMediaList(
       maxBytes,
       out,
       errorPrefix: "discord: failed to download forwarded attachment",
+      fetchImpl,
     });
     await appendResolvedMediaFromStickers({
       stickers: snapshot.message ? resolveDiscordSnapshotStickers(snapshot.message) : [],
       maxBytes,
       out,
       errorPrefix: "discord: failed to download forwarded sticker",
+      fetchImpl,
     });
   }
   return out;
@@ -209,6 +215,7 @@ async function appendResolvedMediaFromAttachments(params: {
   maxBytes: number;
   out: DiscordMediaInfo[];
   errorPrefix: string;
+  fetchImpl?: FetchLike;
 }) {
   const attachments = params.attachments;
   if (!attachments || attachments.length === 0) {
@@ -220,6 +227,7 @@ async function appendResolvedMediaFromAttachments(params: {
         url: attachment.url,
         filePathHint: attachment.filename ?? attachment.url,
         maxBytes: params.maxBytes,
+        fetchImpl: params.fetchImpl,
       });
       const saved = await saveMediaBuffer(
         fetched.buffer,
@@ -296,6 +304,7 @@ async function appendResolvedMediaFromStickers(params: {
   maxBytes: number;
   out: DiscordMediaInfo[];
   errorPrefix: string;
+  fetchImpl?: FetchLike;
 }) {
   const stickers = params.stickers;
   if (!stickers || stickers.length === 0) {
@@ -310,6 +319,7 @@ async function appendResolvedMediaFromStickers(params: {
           url: candidate.url,
           filePathHint: candidate.fileName,
           maxBytes: params.maxBytes,
+          fetchImpl: params.fetchImpl,
         });
         const saved = await saveMediaBuffer(
           fetched.buffer,