fix(ui): remove duplicate AI Regulation Dashboard panel (#2720)

* fix(ui): remove orphan regulation panel key (duplicate of ai-regulation)

The `regulation` key in tech.ts had no lazyPanel registration,
causing a duplicate "AI Regulation Dashboard" toggle in the panel
selector. The real panel is `ai-regulation` (wired to RegulationPanel).
Removed the orphan and updated category references.

* fix(ui): revert dealsInstitutional to regulation (Finance variant)

dealsInstitutional is a Finance variant category where `regulation`
maps to Financial Regulation, not AI Regulation Dashboard. Changing
it to `ai-regulation` orphaned Financial Regulation from the Finance
variant's Deals category selector entirely.

Only the tech variant's securityPolicy needed the regulation->ai-regulation
update (Greptile review on PR #2720).

src/config/panels.ts

@@ -1051,7 +1051,7 @@ export const PANEL_CATEGORY_MAP: Record<string, { labelKey: string; panelKeys: s
   },
   securityPolicy: {
     labelKey: 'header.panelCatSecurityPolicy',
-    panelKeys: ['security', 'policy', 'regulation'],
+    panelKeys: ['security', 'policy', 'ai-regulation'],
   },
   techMarkets: {
     labelKey: 'header.panelCatMarkets',

src/config/variants/tech.ts

@@ -197,7 +197,6 @@ export const DEFAULT_PANELS: Record<string, PanelConfig> = {
   accelerators: { name: 'Accelerators & Demo Days', enabled: true, priority: 1 },
   security: { name: 'Cybersecurity', enabled: true, priority: 1 },
   policy: { name: 'AI Policy & Regulation', enabled: true, priority: 1 },
-  regulation: { name: 'AI Regulation Dashboard', enabled: true, priority: 1 },
   layoffs: { name: 'Layoffs Tracker', enabled: true, priority: 1 },
   markets: { name: 'Tech Stocks', enabled: true, priority: 2 },
   finance: { name: 'Financial News', enabled: true, priority: 2 },