Seamless mouse (VMware backdoor + VBADOS) and fs-backed TOOLS share (#355)

* Seamless mouse via VMware backdoor + fs-backed TOOLS share

v86 (rebuilt libv86.js from fork branch vmware-mouse): new VMwareMouse
device on port 0x5658 implementing GETVERSION/ABSPOINTER_* fed by the
existing mouse-absolute bus event. Move-only packets are coalesced so
the guest cursor never falls more than one frame behind. Emits
vmware-absolute-mouse on the bus when the guest driver toggles mode.

Renderer: listens for that event, keeps the v86 mouse enabled without
pointer lock, drops the startup auto-capture, and hides the host cursor
over the canvas (.seamless-mouse) while the driver is active. Falls back
to click-to-capture when no driver is present.

SMB: TOOLS share is now backed by the bundled guest-tools/ directory
(subdirectories work) with the synthetic README.TXT/_MAPZ.BAT overlaid
at the root. resolve() routes by tid; SEARCH and FIND_FIRST2 share a
single listForSearch helper.

guest-tools/mouse-driver/: VBMOUSE.EXE + VBMOUSE.DRV from VBADOS
(Javier S. Pedro, GPLv2). Load the TSR from AUTOEXEC.BAT and set
mouse.drv=vbmouse.drv in SYSTEM.INI to enable seamless mouse.

Also: tsconfig rootDir "." for TS 6.0 (preserves dist/src/ layout).

* docs: windows95-base now includes vmware-abspointer

guest-tools/README.md

@@ -0,0 +1,23 @@
+# guest-tools
+
+Files and folders in this directory are exposed read-only inside the VM at
+`\\HOST\TOOLS` (alongside the synthetic `_MAPZ.BAT` and `README.TXT`).
+Drop drivers and utilities here that you want available from within
+Windows 95.
+
+## mouse-driver/ — seamless mouse (VBADOS)
+
+`VBMOUSE.EXE` (DOS TSR) + `VBMOUSE.DRV` (Windows 3.x/9x driver) from
+[VBADOS](https://git.javispedro.com/cgit/vbados.git/) by Javier S. Pedro,
+GPLv2. Talks to v86's VMware mouse backdoor (port 0x5658) so the Windows
+95 cursor tracks the host cursor pixel-for-pixel without pointer lock.
+
+Install inside the guest:
+
+1. Copy `\\HOST\TOOLS\mouse-driver\VBMOUSE.EXE` to `C:\` and add a
+   `C:\VBMOUSE.EXE` line to `C:\AUTOEXEC.BAT`.
+2. Windows Setup (or Control Panel → Mouse → General → Change → Have
+   Disk) → browse to `\\HOST\TOOLS\mouse-driver` → pick **VBMouse int33
+   absolute mouse driver**.
+3. Reboot. The app detects the driver and stops grabbing pointer lock;
+   ESC still toggles lock for games that want raw relative input.

guest-tools/mouse-driver/LICENSE.TXT

@@ -0,0 +1,6 @@
+VBMouse - DOS/Windows absolute mouse driver
+Copyright (C) 2022 Javier S. Pedro
+Licensed under the GNU General Public License, version 2 or later.
+
+Source: https://git.javispedro.com/cgit/vbados.git/
+Binaries extracted from https://depot.javispedro.com/vbox/vbados/vbados.flp

guest-tools/mouse-driver/OEMSETUP.INF

@@ -0,0 +1,8 @@
+[data]
+    Version   = "3.0"
+
+[disks]
+    1 =., "VBADOS driver disk", disk1
+
+[pointing.device]
+    vbmouse = 1:vbmouse.drv, "VBMouse int33 absolute mouse driver", x:*vmd, vbmouse

guest-tools/mouse-driver/VBMOUSE.EN

@@ -0,0 +1,54 @@
+# Language: English
+# Codepage: 437
+#
+# Spaces before text must be kept. Be sure that no spaces are
+# added to the end of the lines.
+#
+0.0:Usage:
+0.1:  VBMOUSE <ACTION> <ARGS..>
+0.2:Supported actions and options:
+0.3:  install                 Install the driver (default).
+0.4:    low                     Install in conventional memory (otherwise UMB).
+0.5:  uninstall               Uninstall the driver from memory.
+0.6:  wheel <ON|OFF>          Enable/disable wheel API support.
+0.7:  wheelkey <KEY|OFF>      Emulate a specific keystroke on wheel scroll.
+0.8:                            Supported keys: updn, pageupdn.
+0.9:  integ <ON|OFF>          Enable/disable VirtualBox integration.
+0.10:  hostcur <ON|OFF>        Enable/disable mouse cursor rendering in the host.
+0.11:  reset                   Reset mouse driver.
+1.0:Wheel mouse found and enabled\n
+1.1:Setting wheel support to %s\n
+1.2:enabled
+1.3:disabled
+1.4:Generate Up Arrow / Down Arrow key presses on wheel movement\n
+1.5:Generate PageUp / PageDown key presses on wheel movement\n
+1.6:Disabling wheel keystroke generation\n
+1.7:VirtualBox integration enabled\n
+1.8:Disabled VirtualBox integration\n
+1.9:VirtualBox integration already disabled or not available\n
+1.10:Setting host cursor to %s\n
+1.11:Found VMware protocol version %ld\n
+1.12:VMware integration enabled\n
+1.13:Disabled VMware integration\n
+1.14:VMware integration already disabled or not available\n
+1.15:Neither VirtualBox nor VMware integration available\n
+1.16:VirtualBox integration not available\n
+1.17:Driver installed\n
+1.18:Driver uninstalled\n
+1.19:Reset mouse driver\n
+1.20:\nVBMouse %x.%x (like MSMOUSE %x.%x)\n
+1.21:VBMouse already installed\n
+3.0:Could not find PS/2 wheel mouse\n
+3.1:Wheel not detected or support not enabled\n
+3.2:Unknown key '%s'\n
+3.3:Cannot find VirtualBox PCI device, err=%d\n
+3.4:Cannot lock buffer used for VirtualBox communication, err=%d\n
+3.5:VirtualBox communication is not working, err=%d\n
+3.6:Could not detect VMware, err=%ld\n
+3.7:VMware absolute pointer error, err=0x%lx\n
+3.8:Cannot init PS/2 mouse BIOS, err=%d\n
+3.9:INT33 has been hooked by someone else, cannot safely remove\n
+3.10:INT2F has been hooked by someone else, cannot safely remove\n
+3.11:Driver data not found (driver not installed?)\n
+3.12:Invalid argument '%s'\n
+3.13:Argument required for '%s'\n