refactor: split source files that exceeded the ~300-line ceiling

Mechanical moves only — operations, store, history_view, and settings_view
are now split along their existing seams so every file stays within the 250+20%
guideline. Document the new layout in ARCHITECTURE.md and close the ROADMAP item.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/app/operations_validate.go

@@ -0,0 +1,91 @@
+package app
+
+import (
+	"errors"
+	"path/filepath"
+	"strings"
+
+	"gitea.mixdep.ru/mix/gosentry/src/domain"
+)
+
+// normalizeJob trims user-entered fields and applies the same defaults the job
+// dialog used, so callers do not have to.
+func normalizeJob(job *domain.Job) {
+	job.Name = strings.TrimSpace(job.Name)
+	job.Folder = strings.TrimSpace(job.Folder)
+	job.Schedule = strings.TrimSpace(job.Schedule)
+	job.Command = strings.TrimSpace(job.Command)
+	job.Arguments = strings.TrimSpace(job.Arguments)
+}
+
+// validateJob enforces the minimum executable definition: name, schedule, and
+// command must be present. Folder is optional. The schedule string itself is not
+// rejected for being unparseable — that surfaces later as an "Invalid schedule"
+// next-run, matching the prior behavior.
+func validateJob(job domain.Job) error {
+	if job.Name == "" || job.Schedule == "" || job.Command == "" {
+		return errors.New("name, schedule, and command are required")
+	}
+	policy := strings.TrimSpace(job.OverlapPolicy)
+	if policy != "" && policy != string(domain.OverlapPolicySkip) && policy != string(domain.OverlapPolicyQueue) {
+		return errors.New("overlap policy must be 'skip', 'queue', or empty")
+	}
+	if job.TimeoutSeconds != nil && *job.TimeoutSeconds < 0 {
+		return errors.New("timeout must be zero (no timeout) or a positive number of seconds, or unset to inherit the global default")
+	}
+	return nil
+}
+
+// hasFileName reports whether a path ends in something that can be a file name.
+// It is a syntax check only — an existing directory whose name looks like a file
+// name still passes, and fails at write time — but it catches the shapes a user
+// types when they mean a folder: a trailing separator, "." and "..".
+func hasFileName(path string) bool {
+	if strings.HasSuffix(path, "/") || strings.HasSuffix(path, string(filepath.Separator)) {
+		return false
+	}
+	switch filepath.Base(path) {
+	case ".", "..", string(filepath.Separator):
+		return false
+	}
+	return true
+}
+
+// validateConfig rejects settings that would break persistence or cleanup.
+func validateConfig(config domain.Config) error {
+	jobsFile := strings.TrimSpace(config.JobsFile)
+	if jobsFile == "" {
+		return errors.New("jobs file is required")
+	}
+	// A path that names only a folder would be written to as if it were a file
+	// and fail later with an opaque OS error, so require a file name here.
+	if !hasFileName(jobsFile) {
+		return errors.New("jobs file must include a file name")
+	}
+	if strings.TrimSpace(config.LogsDir) == "" {
+		return errors.New("logs directory is required")
+	}
+	// 0 means "keep everything" (see runner.CleanupLogs); only a negative count
+	// is rejected, the same three-state shape as DefaultTimeoutSeconds below.
+	if config.MaxLogFiles < 0 {
+		return errors.New("max log files must be zero (unlimited) or a positive number")
+	}
+	if config.MaxLogAgeDays < 0 {
+		return errors.New("max log age days must be zero (unlimited) or a positive number")
+	}
+	if config.ExecutionMode != domain.ExecutionModeParallel && config.ExecutionMode != domain.ExecutionModeSequential {
+		return errors.New("execution mode must be 'parallel' or 'sequential'")
+	}
+	if config.OverlapPolicy != domain.OverlapPolicySkip && config.OverlapPolicy != domain.OverlapPolicyQueue {
+		return errors.New("overlap policy must be 'skip' or 'queue'")
+	}
+	if config.DefaultTimeoutSeconds < 0 {
+		return errors.New("default timeout must not be negative (0 means no timeout)")
+	}
+	// Empty Theme is accepted and normalized to the branded theme on load, so
+	// older configs (and hand-built ones) stay valid without an explicit theme.
+	if config.Theme != "" && config.Theme != domain.ThemeSystem && config.Theme != domain.ThemeGoSentry {
+		return errors.New("theme must be 'system' or 'gosentry'")
+	}
+	return nil
+}