docs refactor

docs/plus_features/message_screen.md

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+View and send messages using the on-screen keyboard or predefined quick replies. The keyboard supports placeholders that insert live sensor data — `{time}` and `{loc}` are always available; additional placeholders (`{temp}`, `{hum}`, `{pres}`, `{batt}`, `{alt}`, `{lux}`, `{co2}`) appear automatically for sensors that are connected and returning data.
+
+Each message in the history list shows the sender name and a compact age indicator (`3m`, `2h`, `>1d`) in the top-right corner of the entry.
+
+```
+╔══════════════════════════════╗
+║          #general            ║
+╠══════════════════════════════╣
+║▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓ ║  ← selected
+║ Alice                   3m   ║
+║ Hey, let's meet tomorrow     ║
+║┌───────────────────────────┐ ║
+║│▓▓▓▓▓▓▓▓▓ Bob      1h ▓▓▓▓ │ ║
+║│ Sure, what time works?    │ ║
+║└───────────────────────────┘ ║
+║[+ send]                      ║
+╚══════════════════════════════╝
+```
+
+Press Enter on a message to open it in fullscreen. Navigate between messages with left (newer) and right (older). If the message is a reply addressed to someone (`@[nick]`), a **To: nick** bar is shown below the sender name and the body is displayed without the address prefix.
+
+```
+╔══════════════════════════════╗
+║▓▓ Alice ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓ ║  ← sender
+║▓▓ To: Bob ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓ ║  ← recipient
+╠══════════════════════════════╣
+║ Hey Bob, let's meet up       ║
+║ tomorrow at 6pm downtown.    ║
+║ Will you make it?            ║
+║                              ║
+║< newer                older >║
+╚══════════════════════════════╝
+```
+
+Hold Enter on a message to open a context menu. From the list or fullscreen view, select **Reply** to pre-fill the keyboard or a quick message with `@[nick]` so the recipient is clearly addressed. The reply picker title shows the recipient's name.
+
+```
+╔══════════════════════════════╗
+║           RE:Alice           ║
+╠══════════════════════════════╣
+║> Custom message...           ║
+║  OK, I understand            ║
+║  On my way                   ║
+║  Be right there              ║
+╚══════════════════════════════╝
+```
+
+On channel or contact list entries, the context menu also lets you change per-channel notification settings (mute, follow global, or force-on), per-channel melody override (follow global, Melody 1, or Melody 2), or mark messages as read.
+
+**Mark all read** — Hold Enter on the DM / Channels / Rooms mode-select screen to clear all unread counters for the highlighted category at once.