Fix Resizetizer validation failure: calendar tags → derived SemVer/platform versions

[Copilot]

Calendar-format release tags (vYYYY.M.D) were passed directly as ApplicationDisplayVersion, which fails Microsoft.Maui.Resizetizer's strict 3-part SemVer requirement and breaks Windows release builds.

Version derivation strategy

Given tag vYYYY.M.D:

Output	Formula	v2026.4.1 example
ApplicationDisplayVersion (SemVer, both platforms)	YY.M.DOY	26.4.91
Windows ApplicationVersion (MSIX 4-part)	YYYY.M.D.0	2026.4.1.0
Android ApplicationVersion (versionCode int)	YYYY * 1000 + DOY	2026091

Where YY = YYYY - 2000, DOY = day-of-year (1–366).

Changes

• release_windows.yml — Replaces raw tag extraction with PowerShell that validates ^v(\d{4})\.(\d{1,2})\.(\d{1,2})$, computes DOY via Get-Date, derives APP_DISPLAY_VERSION and APP_MSIX_VERSION, and passes APP_DISPLAY_VERSION to dotnet publish.

• release_android.yml — Same tag validation in bash (date -d for DOY), derives the same APP_DISPLAY_VERSION and a monotonically increasing APP_ANDROID_VERSION integer, passed to dotnet publish.

• README.md — Documents the required tag format, derivation formulas, and example conversions.

[codacy-production]

Up to standards ✅

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