fix: move embed to repo root; make build sequential

- Move embed_prod.go/embed_dev.go out of cmd/wotra/ into root-level
  assets_prod.go / assets_dev.go (package assets). go:embed paths
  must be relative to the source file; cmd/wotra/ cannot reach
  ../../web/build.
- Update cmd/wotra/main.go to import the root assets package.
- Change mise.toml build task from parallel depends to sequential
  shell commands (build:web then build:go) so the frontend is always
  compiled before the Go embed runs.

assets_dev.go

@@ -0,0 +1,9 @@
+// assets_dev.go — used in non-production builds (no web/build required)
+//go:build !production
+
+package assets
+
+import "io/fs"
+
+// FS is nil in dev mode; the router skips static file serving.
+var FS fs.FS

assets_prod.go

@@ -0,0 +1,21 @@
+// assets_prod.go — used in production builds (requires web/build to exist)
+//go:build production
+
+package assets
+
+import (
+	"embed"
+	"io/fs"
+)
+
+//go:embed all:web/build
+var embeddedWeb embed.FS
+
+// FS is the sub-filesystem rooted at web/build.
+var FS fs.FS = func() fs.FS {
+	sub, err := fs.Sub(embeddedWeb, "web/build")
+	if err != nil {
+		panic(err)
+	}
+	return sub
+}()

cmd/wotra/embed_dev.go

@@ -1,9 +0,0 @@
-// embed_dev.go — used in non-production builds (no web/build directory required)
-//go:build !production
-
-package main
-
-import "io/fs"
-
-// webFS is nil in dev mode; the router will skip static file serving.
-var webFS fs.FS

cmd/wotra/embed_prod.go

@@ -1,20 +0,0 @@
-// embed_prod.go — used in production builds (requires web/build to exist)
-//go:build production
-
-package main
-
-import (
-	"embed"
-	"io/fs"
-)
-
-//go:embed all:../../web/build
-var embeddedWeb embed.FS
-
-var webFS fs.FS = func() fs.FS {
-	sub, err := fs.Sub(embeddedWeb, "web/build")
-	if err != nil {
-		panic(err)
-	}
-	return sub
-}()

cmd/wotra/main.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"context"
-	"io/fs"
 	"log/slog"
 	"net/http"
 	"os"
@@ -10,6 +9,7 @@ import (
 	"syscall"
 	"time"
 
+	assets "github.com/wotra/wotra"
 	"github.com/wotra/wotra/internal/config"
 	"github.com/wotra/wotra/internal/handler"
 	"github.com/wotra/wotra/internal/service"
@@ -56,13 +56,8 @@ func main() {
 	defer cancel()
 	go runMidnightGuard(ctx, entrySvc)
 
-	// Static SPA files (embedded or from disk for dev)
-	var staticFS fs.FS
-	if webFS != nil {
-		staticFS = webFS
-	}
-
-	router := handler.NewRouter(cfg.AuthToken, entrySvc, daySvc, settingsSvc, weekSvc, syncStore, entryStore, adjustmentStore, settingsStore, staticFS)
+	// Static SPA files (embedded or nil for dev)
+	router := handler.NewRouter(cfg.AuthToken, entrySvc, daySvc, settingsSvc, weekSvc, syncStore, entryStore, adjustmentStore, settingsStore, assets.FS)
 
 	srv := &http.Server{
 		Addr:         ":" + cfg.Port,

mise.toml

@@ -10,8 +10,11 @@ DB_PATH = "wotra.db"
 TZ = "UTC"
 
 [tasks.build]
-description = "Build production single binary (web + Go)"
-depends = ["build:web", "build:go"]
+description = "Build production single binary (web + Go, sequential)"
+run = """
+mise run build:web
+mise run build:go
+"""
 
 [tasks."build:web"]
 description = "Build Svelte frontend"