RoweMod 0.5.2 - menu and Steam startup fixes

RoweMod 0.5.2

Repairs the multiplayer menu's widget lifecycle: text drafts are captured before
the old page is detached, and stale text-box/status references are released.
This addresses a plausible cause of the reported crash when returning to the
Multiplayer tab. The exact user's crash cannot be confirmed without its log/dump;
please retest repeated tab changes with this build.

Steam startup now replaces the starting footer with live readiness or error
information, times out after 30 seconds without a response, and reports hidden
companion startup failures in the game. Wait for Steam ready, then choose
Host Friends or Find Friends. Starting the companion does not itself join
a multiplayer session.

Also includes the audited slider ranges and fixed numeric formatting, recovery
for excessive old preset values, and Movement > Gravity (0.25x–2.00x).

Download RoweMod-0.5.2.zip, extract everything, close Rollout and RoweMod Online,
and run install.cmd. UE4SS is bundled. Existing 0.5.1 installations can also
receive this through automatic updates after closing the game and companion.

Validation: 15 Lua suites and 43 Python tests passed, including detached-widget
access guards, startup errors/timeouts/readiness, settings migration and gravity
reset/map travel. In-game tab-crash retesting, gravity feel, and complete
two-account internet play remain pending.