Fix/deadcells crash (#262)

* Boot compatibility fixes for UE titles, GUI toggles, and DeS render/boot work

Checkpoint of the Monster Truck Championship and Demon's Souls boot work.
Each piece is independently useful and verified against the titles.

- playgo: scePlayGoGetLocus now returns BAD_CHUNK_ID for chunk ids outside
  the known set, matching real firmware. Titles enumerate chunk ids until
  that error; answering OK for every id made the scan wrap the ushort range
  and spin forever. Missing-sidecar and no-app0 fallbacks report a
  fully-installed single chunk 0 so scePlayGoOpen keeps succeeding.
- kernel: restore the SHARPEMU_WRITABLE_APP0 opt-in. Unpackaged UE dumps
  write their Saved tree under /app0 during PS5 component init and treat
  the denial as a fatal boot error.
- pad: accept handle 0 as the primary pad across all pad calls. Real
  firmware hands out small non-negative handles and some titles read state
  with handle 0.
- bthid: env-gated experiment hooks for the Thrustmaster wheel middleware
  investigation (fail-only-RegisterCallback modes and a synthetic
  enumeration callback with a zeroed event struct). All default off.
- gui: add SHARPEMU_LOG_IO and SHARPEMU_WRITABLE_APP0 toggles to the
  Environment tab.
- videoout: per-swapchain-image render-finished semaphores (the shared
  semaphore raced the swapchain); whole-mip-chain layout init for offscreen
  guest images (sampled binds read mips stuck in Undefined); GPU-resident
  texture availability now canonicalizes through the texture format table
  and accepts compatibility-class aliases, cutting per-frame CPU texture
  re-reads (143 GB -> 55 GB per 300 s in Demon's Souls, 0.2 -> 0.5 fps).
- hle: add sceSystemServiceGetNoticeScreenSkipFlag,
  sceSystemServiceGetMainAppTitleId (title id published from the runtime),
  and sceNpWebApi2CreateUserContext (refuses so the online layer backs off).
- rtc: SHARPEMU_RTC_PROBE_RANGE diagnostic dumps the code around a busy-wait
  caller of sceRtcGetCurrentTick once; costs nothing when unset.

* [ShaderCompiler] Fix VReadlaneB32 scalar destination field

The scalar destination lives in the low vdst byte (bits 0-7); it was read
from bits 8-14, the VOP3B carry-out field readlane does not have, sending
every readlane result to s0. Verified against raw gfx10 encodings and
LLVM's assembler tests (v_readlane_b32 s5, v1, s2 -> low byte 0x05).

* [VideoOut] Survive device loss and flip-order asserts without dying

Two ways a frame could take down the whole presenter:

- Device loss between any two Vulkan calls in a frame unwound the window
  thread, and the Dispose-time fence check then threw again, masking the
  original error. Catch the loss at the frame boundary, retire
  presentations and guest submissions whose fences can never signal, and
  keep the window loop pumping so the game (audio, logic) carries on.
- The ordered-flip capture invariant is violated ~100 times per run by
  Demon's Souls (PPSA01342); on debug builds the Debug.Assert fail-fasts
  the process with nothing in the log. Downgrade it to a once-per-version
  warning until the capture/wait ordering is understood.

* Fix Dead Cells shader cache regression

---------

Co-authored-by: StealUrKill <35749471+StealUrKill@users.noreply.github.com>

src/SharpEmu.GUI/Languages/en.json

@@ -31,9 +31,11 @@
   "Options.Env.Desc": "Switches passed to the emulator as environment variables at launch.",
   "Options.Env.Bthid.Desc": "Report Bluetooth HID as unavailable for titles whose wheel/FFB middleware polls forever.\nLeave off normally. Some titles freeze when init fails.",
   "Options.Env.LoopGuard.Desc": "Do not force quit titles that repeat the same call for too long.\nTry this when a game exits on its own while loading.",
+  "Options.Env.WritableApp0.Desc": "Allow titles to create and write files inside their install folder.\nNeeded by unpackaged dumps that write their save or config data under /app0.",
   "Options.Env.VkValidation.Desc": "Enable Vulkan validation layers for GPU debugging.\nSlow. Requires the Vulkan SDK to be installed.",
   "Options.Env.DumpSpirv.Desc": "Dump AGC shaders and their SPIR-V translations to the shader-dumps folder.\nUse when reporting shader or rendering bugs.",
   "Options.Env.LogDirectMemory.Desc": "Log direct memory allocations and failures to the console.\nUse when a game aborts or exits during boot.",
+  "Options.Env.LogIo.Desc": "Log file open, read, and path-resolve activity to the console.\nUse when a game cannot find its data files during boot.",
   "Options.Env.LogNp.Desc": "Log NP (PlayStation Network) library calls to the console.",
   "Options.Section.Emulation": "EMULATION",
   "Options.Section.Logging": "LOGGING",