[5.2] — HomeScreen Redesign & Online Node Counter

Online node counter — HomeScreen now shows how many nodes have been
heard in the last 30 minutes, combining advert senders and message senders
in a single deduplicated count (16-entry LRU cache)
Node counter icon — the online count is displayed with a filled circle
icon (●) instead of plain [X] text
Real channel name in title bar — message history and favorite preview
now show the actual channel name (e.g. "Public") instead of the hardcoded
"[CH]" tag
Mode indicator — GPS-SHARE and OFF-GRID modes are now shown on the
HomeScreen FIRST page

M1 HomeScreen layout — node counter fixed at y=22 regardless of
connection state; MSG:X replaces < Connected > when disconnected;
nodes_icon y-offset corrected (+3px) to align with text baseline
Channel message title bar — sender name omitted from title bar for
channel messages (already visible inside the message text)
Favorite indicator — clears correctly after all messages are deleted
(deleteEntry / clearAll); no longer persists stale data after app sync
MSG:X counter — hidden on HomeScreen while phone app is connected
RECENT/TRACKING pages — row limits now display-height-adaptive via
max_y variable instead of hardcoded values

BLE init: send_queue flood — between onSecured() and CMD_APP_START
async pushes could fill all 12 send_queue slots, causing the app to time
out. Fixed via _app_initialized flag and isWriteBusy() guard
Double-counting in node counter — nodes heard via both advert and
message were counted twice. Fixed via countOnlineNodesExcluding()
adv_fresh buffer — was reusing the 4-entry RECENT display array,
capping the advert-based node count at 4. Now uses a dedicated
ADVERT_PATH_TABLE_SIZE (16) buffer
formatRelTime undefined behavior — replaced signed int cast with
safe uint32_t arithmetic

Changes confined to UITask.cpp, UITask.h, MyMesh.cpp, MyMesh.h,
icons.h
DataStore, AbstractUITask, platformio.ini unaffected

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