Enhance Page-Trail and Inspector

[cerberus-ab]

Added

• PageTrail container elements and structure tree for representing page context and layout.
• Detailed context.path data for content and interactive elements, including container relevance and breadcrumb context.
• Dev mode for Page Inspector with enriched PageTrail records and metadata diagnostics.
• Tooltips across popup and Inspector controls, replacing native title hints.

Changed

• Reworked PageTrail scoring and semantic formatting around meaning, context relevance, and target importance.
• Updated backend tools to use detailed PageTrail context.path when describing matched elements and content.
• Expanded PageTrail metadata timings with per-stage collection durations.
• Improved Markdown output for the Inspector semantic view.
• Limited extracted label and text values to keep PageTrail records concise.