feat: worklog source field, suggestion logic fix, modal form, activity navigation

- Add source column to worklog_entries (migration 014): manual/suggestion/unknown
- GetSuggestions now excludes only events linked in worklog_entry_events,
  not entire nodes — repeated activity same day now produces suggestions
- Manual entry form replaced with '+' button + modal dialog
- Source display shows correct origin (manual/suggestion/unknown/no-events)
- Include-children checkbox hidden when no node selected
- Activity events navigate to specific notes/files instead of just case
- Expandable row reactivity fixed (journalRows/worklog reassignment)

internal/core/storage/migrations_014.sql.go

@@ -0,0 +1,6 @@
+package storage
+
+// migration014 — add source column to worklog_entries.
+const migration014 = `
+ALTER TABLE worklog_entries ADD COLUMN source TEXT NOT NULL DEFAULT 'unknown';
+`

internal/core/storage/storage.go

@@ -70,6 +70,7 @@ var migrationFiles = map[int]string{
 	11: migration011,
 	12: migration012,
 	13: migration013,
+	14: migration014,
 }
 
 func (db *DB) runInitialSchema() error {