feat(toolbars): support presets for selection and slash menus

[makhnatkin]

Shared configuration for all toolbars (Closes #1226)

• Added shared preset configuration for selection and slash toolbars.
• Deprecated legacy contextual configuration while preserving compatible fallbacks.
• Preserved command selection and updated open menus when configurations change.
• Updated customization examples, migration documentation, and regression coverage.

[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="packages/editor/src/extensions/behavior/CommandMenu/handler.ts" line_range="145-158" />
<code_context>
         this.clear();
     }

+    update(view: EditorView, prevState: EditorState): void {
+        if (
+            this.#view &&
+            contextualToolbarsKey.getState(view.state)?.slash !==
+                contextualToolbarsKey.getState(prevState)?.slash
+        ) {
+            this.#view = view;
+            const needToClose = this.filterActions();
+            if (!this.actions.length || needToClose) {
+                this.#menuRenderItem?.remove();
+                this.#menuRenderItem = undefined;
+                this.closeAutocomplete(view);
+            } else {
+                this.render();
+            }
+        }
</code_context>
<issue_to_address>
**issue (bug_risk):** `update` rerenders the command menu whenever the contextual preset changes as long as `#view` was previously set, even after the autocomplete menu has been closed. `clear()` removes the render item but does not clear `#view`, so changing the toolbar preset while no slash menu is open recreates a menu render item from stale command-menu state.

**Triggers:** When a slash menu has been opened and closed, then `toolbarsPreset` changes before another slash menu is opened.

**Suggested fix:** Track whether autocomplete is currently active and return from `update` when it is not, or clear `#view` and the filter state in `clear()`.
</issue_to_address>

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[sourcery-ai]

issue (bug_risk): update rerenders the command menu whenever the contextual preset changes as long as #view was previously set, even after the autocomplete menu has been closed. clear() removes the render item but does not clear #view, so changing the toolbar preset while no slash menu is open recreates a menu render item from stale command-menu state.

Triggers: When a slash menu has been opened and closed, then toolbarsPreset changes before another slash menu is opened.

Suggested fix: Track whether autocomplete is currently active and return from update when it is not, or clear #view and the filter state in clear().

[gravity-ui]

[gravity-ui]