Vendor wgpu-hal 29.0.4 and i-slint-renderer-skia 1.17.1, unmodified

The Android develop view reads its frame back through memory (TD-1)
because wgpu's Vulkan swapchain never pre-rotates, and a portrait window
on this tablet's landscape panel then tears. The fix is a small patch to
each of these two crates, and this commit is only the ground it lands on:
both are byte-for-byte the crates.io sources the lockfile already
resolved, so the commits that follow are the patch and nothing else.

third_party/ is excluded from the workspace, or every path dependency
under the root would become a member and `--workspace` would test and
lint upstream code as ours. The README says how to carry the patches
across a Slint or wgpu bump, which matters because a stale version here
does not fail the build — cargo just warns and uses the unpatched crate.

Cargo.toml

@@ -27,6 +27,9 @@ members = [
     "tools/bench",
     "tools/traceability",
 ]
+# Patched copies of upstream crates, not our code: see third_party/README.md.
+# Excluded so `--workspace` does not test, lint or format them as ours.
+exclude = ["third_party"]
 
 [workspace.package]
 version = "0.14.1"
@@ -266,3 +269,12 @@ opt-level = 0
 [profile.release]
 lto = "thin"
 codegen-units = 1
+
+# Two upstream crates carry a local patch so that the Android build can draw
+# with wgpu on a rotated display (technical-debt.md TD-1). Both are exact
+# copies of the version the lockfile already resolves, plus that patch;
+# third_party/README.md says what was changed and how to carry it forward
+# when Slint or wgpu moves.
+[patch.crates-io]
+wgpu-hal = { path = "third_party/wgpu-hal-29.0.4" }
+i-slint-renderer-skia = { path = "third_party/i-slint-renderer-skia-1.17.1" }