Phase 7: SDK + LLM + Tools views (forum style)

[CalebisGross]

Part of #339

Migrate the remaining three views:

SDK:

• Agent stats as welcome panel, principles/strategies as collapsible forum blocks
• Chat panel preserved (WebSocket unchanged)
• Cost chart from charts.js

LLM:

• Range tabs, stat cards, stacked bar chart from charts.js
• Agent/operation tables as forum rows

Tools + Research Analytics:

• Range tabs, charts from charts.js
• 6 KPIs with sparklines, lifecycle chart, signal quality, recall curve
• Cognitive agent cards, session timeline

[CalebisGross]

Partially done. SDK/LLM/Tools headers restyled with .fblock-title. Chat panel, stat cards, tables all functional. Remaining: wrap in .forabg containers, D3 shim chart rendering bugs for lifecycle/signal/recall charts (sparklines now work). Will complete in Phase 8 polish.