refactor: centralize duplicate MD5 and date-formatting utilities

[Copilot]

Multiple files contained inline re-implementations of identical MD5 hashing and date formatting logic. This consolidates them into shared modules.

New shared modules

• lib/server/crypto.ts — calculateMD5(text): normalized (lowercase + trim) MD5 hash
• lib/shared/date-format.ts — date formatters: formatDate, formatDateWithDots, formatDateTime, formatDateTimeWithSeconds, formatDateTimeLocale
• lib/client/media-exif.ts — added formatShotDateTime (consolidated from PhotoDetailClient and PhotoModalClient)

Consumers updated

Module	Now imports from
actions/comment.ts, actions/user.ts, actions/message.ts	lib/server/crypto
PostCard, AdjacentPostCard, ProjectDetailSections, CommentsSection	lib/shared/date-format
CloudReport, CloudHistoryTable, FriendsTable, FriendLinkApplyClient	lib/shared/date-format
PhotoDetailClient, PhotoModalClient	lib/client/media-exif

Example

Before (repeated across 3 action files):

import crypto from "crypto";
const hash = crypto.createHash("md5").update(email.toLowerCase().trim()).digest("hex");

After:

import { calculateMD5 } from "@/lib/server/crypto";
const hash = calculateMD5(email);

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[RavelloH]

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