Today view and Inbox section: dynamic query, not stored sections

- ListTodayView() on backend: queries nodes created or updated today
  using local timezone day boundaries
- todayBoundaries() helper returns start/end of current day in RFC3339
- Section validation: Create() rejects today and inbox as node sections
- validSections moved from repository.go to types.go with IsValidSection
  and IsServiceSection helpers
- Frontend selectSection('today') calls ListTodayView instead of
  ListNodesBySection('today')
- FAB (create node) hidden in today and inbox sections
- CreateNode in app.go guarded against today/inbox sections
- types.go: today/inbox defined as service sections (sidebar only)

frontend/src/App.svelte

@@ -135,7 +135,11 @@
     showCreateNode = false
     error = ''
     try {
-      nodes = await wailsCall('ListNodesBySection', id) || []
+      if (id === 'today') {
+        nodes = await wailsCall('ListTodayView') || []
+      } else {
+        nodes = await wailsCall('ListNodesBySection', id) || []
+      }
     } catch (e) {
       error = String(e)
       nodes = []
@@ -1055,7 +1059,7 @@
       </div>
     {/if}
 
-    {#if !noteEditor && !selectedNode}
+    {#if !noteEditor && !selectedNode && selectedSection !== 'today' && selectedSection !== 'inbox'}
       <div class="fab" on:click={openCreateNode} title="Добавить дело">+</div>
     {/if}
 

frontend/src/api/verstak.js

@@ -3,6 +3,7 @@ import * as App from '../wailsjs/go/main/App.js'
 
 // Re-export all methods
 export const listSections = () => App.ListSections()
+export const listTodayView = () => App.ListTodayView()
 export const listNodesBySection = (section) => App.ListNodesBySection(section)
 export const listChildren = (parentID) => App.ListChildren(parentID)
 export const getNodeDetail = (id) => App.GetNodeDetail(id)
@@ -31,6 +32,7 @@ export const duplicateNode = (nodeID) => App.DuplicateNode(nodeID)
 export const renameNode = (nodeID, newTitle) => App.RenameNode(nodeID, newTitle)
 export const moveNode = (nodeID, newParentID) => App.MoveNode(nodeID, newParentID)
 export const openFolder = (nodeID) => App.OpenFolder(nodeID)
+export const validateName = (name) => App.ValidateName(name)
 
 export const listActions = (nodeID) => App.ListActions(nodeID)
 export const runAction = (id) => App.RunAction(id)

frontend/src/wailsjs/go/main/App.js

@@ -6,6 +6,10 @@ export function ListSections() {
     return window['go']['main']['App']['ListSections']();
 }
 
+export function ListTodayView() {
+    return window['go']['main']['App']['ListTodayView']();
+}
+
 export function ListNodesBySection(arg1) {
     return window['go']['main']['App']['ListNodesBySection'](arg1);
 }