chore: upgrade templ v0.3.1001 → v0.3.1020, pin in Dockerfile

Newer templ generates ResolveAttributeValue calls that don't exist in
v0.3.1001 runtime, causing Docker build failures ("undefined:
templ.ResolveAttributeValue"). Pin templ CLI version in Dockerfile to
match go.mod instead of using @latest.

Also updated local templ CLI to v0.3.1020 to match.

Dockerfile

@@ -11,7 +11,7 @@ RUN wget -O /tmp/sqlc.tar.gz https://github.com/sqlc-dev/sqlc/releases/download/
     tar -xzf /tmp/sqlc.tar.gz -C /usr/local/bin sqlc && \
     rm /tmp/sqlc.tar.gz
 RUN --mount=type=cache,target=/root/go/pkg/mod \
-  go install github.com/a-h/templ/cmd/templ@latest
+  go install github.com/a-h/templ/cmd/templ@v0.3.1020
 
 # Copy package files and install npm dependencies (cached unless package.json changes)
 COPY package*.json ./

go.mod

@@ -4,7 +4,7 @@ go 1.26.0
 
 require (
 	github.com/ArcadiaLin/go-epub v0.1.1
-	github.com/a-h/templ v0.3.1001
+	github.com/a-h/templ v0.3.1020
 	github.com/andybalholm/brotli v1.2.1
 	github.com/bodgit/plumbing v1.3.0
 	github.com/bodgit/windows v1.0.1

go.sum

@@ -1,7 +1,7 @@
 github.com/ArcadiaLin/go-epub v0.1.1 h1:13roe62tarrZ1Y1QTxE+Bzd/NKlChhRzegLVmU5Hgws=
 github.com/ArcadiaLin/go-epub v0.1.1/go.mod h1:GY09AG6jnEbsYytkw6VeICLOt25F1GQDGXjYS7cxNhU=
-github.com/a-h/templ v0.3.1001 h1:yHDTgexACdJttyiyamcTHXr2QkIeVF1MukLy44EAhMY=
-github.com/a-h/templ v0.3.1001/go.mod h1:oCZcnKRf5jjsGpf2yELzQfodLphd2mwecwG4Crk5HBo=
+github.com/a-h/templ v0.3.1020 h1:ypAT/L5ySWEnZ6Zft/5yfoWXYYkhFNvEFOeeqecg4tw=
+github.com/a-h/templ v0.3.1020/go.mod h1:A2DlK61v+K+NRoGnhmYbNYVmtYHcFO5/AisMvBdDxTM=
 github.com/alecthomas/chroma v0.10.0 h1:7XDcGkCQopCNKjZHfYrNLraA+M7e0fMiJ/Mfikbfjek=
 github.com/alecthomas/chroma v0.10.0/go.mod h1:jtJATyUxlIORhUOFNA9NZDWGAQ8wpxQQqNSB4rjA/1s=
 github.com/andybalholm/brotli v1.2.1 h1:R+f5xP285VArJDRgowrfb9DqL18yVK0gKAW/F+eTWro=