feat: optimize wp.org listing — title, excerpt & tags

- Title: drop "for WordPress" (compliance) and add "Built-in AI Generator" anchor
- Excerpt: trim to <=150 chars (was 159, getting truncated)
- Tags: replace generic 'pie' and 'graphs' with high-intent 'datatable', 'data-visualization', 'ai-charts'

Tags now match the wp.org table-plugin leader pattern (3/3 leaders use 'datatable').

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ineagu

readme.txt

@@ -1,14 +1,14 @@
-=== Visualizer: Tables and Charts Manager for WordPress ===
+=== Visualizer – Tables & Charts Manager with Built-in AI Generator ===
 Contributors: codeinwp,themeisle,marius2012,marius_codeinwp,hardeepasrani,rozroz,Madalin_ThemeIsle
-Tags: tables, charts, pie, visualization, graphs
+Tags: charts, tables, datatable, data-visualization, ai-charts
 Requires at least: 5.2
 Tested up to: 6.9
 Requires PHP: 7.4
 Stable tag: trunk
 License: GPL v2.0 or later
 License URI: http://www.opensource.org/licenses/gpl-license.php
 
-Create responsive charts and tables manually or let the built-in AI build them from a simple text prompt. Supports multiple chart types and flexible data sources.
+Create responsive charts and tables manually or let the built-in AI build them from a text prompt. Supports multiple chart types and flexible data.
 
 ## Description ##