Named-peers registry + Options → Manage named peers dialog

Turns the flat friendly-name map into a proper machine-wide book (AppConfig.NamedPeers), and adds a
management dialog. Held for next release.

 * New NamedPeer record (machine name, friendly name, last address, last-seen UTC). AppConfig gains
   NamedPeers; the legacy PeerFriendlyNames map is migrated into it once on load, then no longer
   written. The book stays machine-wide and profile-independent (it always was — this just enriches it).
 * Only deliberately-renamed peers are recorded (per Ed) so the list can't balloon. A named peer's
   last address / last-seen are updated in memory each tick while connected; persisted on address
   change and on app close (timestamp-only changes don't thrash the disk).
 * Options → Manage named peers (Alt+O, N): lists each named peer as "friendly — machine — last seen
   date, address"; Rename (Alt+R / F2 / double-click) reuses RenamePeerDialog; Delete (Alt+D / Del)
   forgets the name. Edits refresh the connected/discovered lists, the volume/pan/EQ list and details
   box live.
 * ApplyFriendlyName now records machine name + last address alongside the name.

Manual updated (readme.html + MANUAL.md). Build clean; --selftest passes; deployed to both test folders.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

MANUAL.md

@@ -273,6 +273,7 @@ Item| Shortcut| What it does
 **Recording settings …**| Alt+O, S| Opens the Recording settings dialog. Up to five lists: _Recording source_ (Alt+S), _File format_ (Alt+F), _Audio format attributes_ (Alt+A), _FLAC compression level_ (Alt+L — only shown when FLAC is chosen), and _Channels_ (Alt+C). The attributes list changes to match the format you pick. OK saves to the current profile; Cancel discards.
 **Keyboard shortcuts …**| Ctrl+K, or Alt+O, K| Opens the global hotkey dialog (mute, volume, show/hide window, start/stop recording, remote-control commands, speak the status line).
 **Profile passwords …**| Alt+O, W| Lists every profile alongside its password, so you can view or change any of them in one place.
+**Manage named peers …**| Alt+O, N| Opens a list of every peer you've given a friendly name to, showing each one's machine name and where and when you last connected to it. Pick one and **Rename (Alt+R** , or F2) to change its name, or **Delete (Alt+D** , or the Del key) to forget it — deleting only drops the name, the peer still connects as normal under its machine name. See the peer-naming notes on the Connectivity tab.
 **Reset the default audio device prompt**|  Alt+O, R| Brings back the “use only the default audio device?” question if you previously ticked “Don't ask me this again” on it. See Following the Windows default audio device.
 **Enable / Disable Realtek ASIO**|  —| Only shown if a Realtek ASIO driver is installed. Lets you reverse the choice RemSound offered about disabling that driver (Realtek's generic ASIO driver tends to grab the wrong device and clash with your screen reader).
 **Preferences …**| Ctrl+P, or Alt+O, P| Opens the Preferences dialog, organised into five tabs (move between them with Ctrl+Tab, or the arrow keys when the tab names have focus): **General** — the profiles folder, accept remote volume commands, UPnP router opening, and “Show the volume, pan and EQ for peers tab” (on by default; hides the Volume, pan and EQ for peers tab if you untick it); **Audio cues** — the cue list and its sounds (see Audio cue sounds); **Startup behaviour** — start minimised / with Windows / with a specific profile; **Update settings** — the update checks and install options; and **Logging** — enable logs, write logs now, and the log-folder housekeeping (see Logs and diagnostics). Esc or the Close button dismisses it.
@@ -308,6 +309,8 @@ Highlight a peer in the **Connected peers** list and press **Rename peer (Alt+M)
 
 In the rename box, type the name and press OK, or press **Clear custom name (Alt+C)** to drop back to the machine name. (Leaving the box empty and pressing OK does the same.) The names are kept per machine you're using RemSound on, and apply in every profile. One case to know about: a peer you added purely by address that never announces a name has no machine name to pin to, so its friendly name is tied to the address instead and would need re-setting if that address changes.
 
+To see and tidy up all your named peers in one place — including ones that are currently offline — use **Options → Manage named peers**. It lists each one with its machine name and when you last connected, and lets you rename or delete any of them.
+
 ## 7. Audio inputs and outputs tab
 
 This tab controls everything to do with which sound devices are involved. The ASIO driver picker at the top decides whether ASIO is being used at all. The Receive side and the Send side each have their own master checkbox and their own device lists.