[xiaoyumuxi]

What this changes

wmSetTitle in internal/platform/windows/title_windows.go moves from 0x8052 to 0x8053, the next number that no private window message uses. The comment beside it now says why the number must differ from wmSetSize.

Why

main does not compile for Windows since #16. Upstream added wmSetSize = 0x8052 (internal/platform/windows/window_windows.go:66), and the fork's Window.SetTitle (#1) had already taken 0x8052 for wmSetTitle. #16 merged both without a text conflict, so the window procedure's switch kind now has two cases with the same value:

internal/platform/windows/window_windows.go:457:7: duplicate case wmSetTitle (constant 32850 of type uintptr) in expression switch
	internal/platform/windows/window_windows.go:451:7: previous case

The checks on #16 showed it: cross-vet, native (windows-latest), windows-arm64-text and windows-materials failed. Lithe-IDEA's desktop client pins main (609dd47) through replace for delta updates, so its Windows build fails the same way.

Upstream has no wmSetTitle (#1 was not sent upstream), so this fix has no upstream counterpart.

The private messages the Windows package uses after this change: 0x8001–0x8007 (32769–32775), 0x8010–0x8012, 0x8016–0x8017 (32790–32791), 0x8040, 0x8050, 0x8051, 0x8052 (wmSetSize), 0x8053 (wmSetTitle).

How it was verified

• test -z "$(gofmt -l $(git ls-files '*.go'))": no files listed
• go vet ./... on macOS (darwin/arm64): passes
• go test ./... -count=1: not run locally. The change is in a windows-only file, which darwin tests do not build; this PR's Windows jobs run it.
• platform vet: GOOS=windows GOARCH=amd64|arm64 CGO_ENABLED=0 go vet ./internal/platform/windows/ ./app/... ./headless/... ./update/... and go build ./... pass for both architectures. On 609dd47 without the change, the same build fails with the duplicate case above.
• [N/A] benchmarks: no paint, layout or input path changed
• [N/A] binary size: what links is unchanged
• a real window: not run; no Windows machine here. Setting a title after the window opens is the path to try on Windows.

Where the boundary sits

A framework fix: the message numbers are internal to the Windows backend.

Cost

Nothing.

After merging

Lithe-IDEA bumps replace github.com/vivaui/viva => github.com/Lithe-IDEA/viva in desktop/go.mod to the commit this PR lands as on main.

Not part of this fix: size, web and windows-materials fail on upstream main too (b63e4a0 and 5b177b7), so they stay red here:

• size: hello darwin/arm64 is 4172546 bytes, over the 3840000-byte limit.
• web: TestApplyPatchChecksNameAndVersions fails on js with update: invalid feed: os "js" has no patch support.