feat: sanction DM links and per-event colour coding (#13)

## Summary

- Adds resource links (appeal form, sanction logs, contact page, community invite) to all sanction DMs, separated from the sanction text by a Components v2 separator
- Adds a unique accent colour for every mod log and activity log event type, giving each action a distinct visual identity at a glance

## Changes

- `src/utils/components.ts` — Added `sanctionDmMessage` helper with two-section container (sanction text + links); added full `Colours` palette covering all sanction and activity event types; added `ColourKey` export
- `src/commands/{ban,kick,mute,softban,warn}.ts` — Updated DMs to use `sanctionDmMessage` with the appropriate colour
- `src/modules/logModAction.ts` / `logActivity.ts` — Thread `colour` parameter through to message builders
- All event and command files updated with their respective colours

✨ This PR was created with help from Hikari~ 🌸

Reviewed-on: #13
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

src/modules/logActivity.ts

@@ -6,11 +6,12 @@
 
 import { ChannelType, type Client } from "discord.js";
 import { channelConfig } from "../config/channels.js";
-import { activityMessage } from "../utils/components.js";
+import { activityMessage, type ColourKey } from "../utils/components.js";
 import { logger } from "../utils/logger.js";
 
 interface ActivityData {
   readonly client: Client;
+  readonly colour: ColourKey;
   readonly emoji:  string;
   readonly fields: string;
   readonly title:  string;
@@ -35,7 +36,9 @@ const logActivity = async(data: ActivityData): Promise<void> => {
       return;
     }
 
-    await rawChannel.send(activityMessage(data.emoji, data.title, data.fields));
+    await rawChannel.send(
+      activityMessage(data.emoji, data.title, data.fields, data.colour),
+    );
   } catch (error) {
     await logger.error(
       "Failed to log activity",

src/modules/logModAction.ts

@@ -7,11 +7,12 @@
 
 import { ChannelType, type Client } from "discord.js";
 import { channelConfig } from "../config/channels.js";
-import { modLogMessage } from "../utils/components.js";
+import { modLogMessage, type ColourKey } from "../utils/components.js";
 import { logger } from "../utils/logger.js";
 
 interface ModuleActionData {
   readonly action:         string;
+  readonly colour:         ColourKey;
   readonly emoji:          string;
   readonly moderatorTag:   string;
   readonly reason:         string;
@@ -57,7 +58,7 @@ const logModerationAction = async(
       join("\n");
 
     await rawChannel.send(
-      modLogMessage(`${data.emoji} ${data.action}`, fields, data.source),
+      modLogMessage(`${data.emoji} ${data.action}`, fields, data.source, data.colour),
     );
   } catch (error) {
     await logger.error(