Comments on plays

- Anyone who can see a play can read its comments; the player and the people they follow can write.
  The author, the player and admins can delete; comments can be reported (admins see the text).
- Notifications: "commented on" for the player, "replied on" for earlier commenters, each with its
  own setting. Reaction and comment notifications now open the play.
- A 💬 chip with the count next to reactions on the feed and recent plays, opening the thread on
  the app (/play/[id]) and the website. Threads refresh every few seconds while open.
- Blocking removes comments between the two people. Plays with comments survive history trimming.
- Privacy page updated.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011Y2iUsKEWDuRGjK5FPmcUP

packages/shared/src/schemas.ts

@@ -53,7 +53,7 @@ export const updateMeSchema = z.object({
     .nullable()
     .optional(),
   notifyPrefs: z
-    .object({ reaction: z.boolean(), follow: z.boolean(), share: z.boolean() })
+    .object({ reaction: z.boolean(), comment: z.boolean(), reply: z.boolean(), follow: z.boolean(), share: z.boolean() })
     .partial()
     .optional(),
   /** Mark onboarding as finished. */
@@ -112,6 +112,12 @@ export const REPORT_REASON_LABELS: Record<ReportReason, string> = {
   impersonation: 'Pretending to be someone else',
   other: 'Something else',
 };
+export const COMMENT_MAX_LENGTH = 500;
+export const commentSchema = z.object({
+  body: z.string().trim().min(1, 'Write something first').max(COMMENT_MAX_LENGTH, `Keep it under ${COMMENT_MAX_LENGTH} characters`),
+});
+export type CommentInput = z.infer<typeof commentSchema>;
+
 export const reportSchema = z.object({
   reason: z.enum(REPORT_REASONS),
   note: z.string().trim().max(500).nullish(),