GLA-59: fix header value truncation/collapse overflow

[paoloanzn]

Summary\n- render header values as collapsible only when they exceed the configured character threshold\n- keep short values as plain text (no details toggle)\n- fix value-column overflow in both collapsed and expanded states with strict width/wrapping constraints\n\n## Validation\n- npm run compile\n- npm run build

[linear]

GLA-59 Panel UX improvements

A pass on the panel UX to make it cleaner and more focused on the mapping workflow, plus a full rebranding from wmai to prism.

Rebranding

Rename everything from wmai to prism across the entire repository:

• package.json (name, description)
• wxt.config.ts (extension name, description)
• manifest fields (name, short_name)
• Any references in README, comments, or config files
• The panel UI itself — displayed name should be Prism, not wmai or Gladium AI

Layout

• Switch from vertical stacking to a two-column split: endpoint list on the left, detail view on the right. Eliminates constant scrolling.

Toolbar

• Merge "Export JSON" and "Export Map" into a single Export button (format as a dropdown or settings option). Having two export buttons is confusing.
• Replace the "Take Snapshot" button + "Live updates enabled" text with a single explicit toggle (e.g. Live / Frozen) — they currently feel contradictory sitting next to each other.
• Remove the "GLADIUM AI / API Map" header — it wastes space inside a DevTools panel.

Endpoint list

• Replace "102 obs" with "102 observations" or "102 seen" — abbreviation is unnecessary.
• Add a tooltip to the 🔑 icon explaining it means auth headers were detected.

Detail view

• Don't render section headers (e.g. Authentication) when there is no content to show.
• Show a redacted/truncated actual value for headers (e.g. Bearer eyJ...) instead of just showing string for every row — the type alone is not useful.

Done when the panel reads "Prism" everywhere, and the UX feels focused and self-explanatory to any developer opening it for the first time.