New outline evaluator and tags on interview cards

• Outline evaluator: new tool reviews research outlines with full context and streams its reasoning and evaluation as it works.
• Selected tags now show on conversation cards and the details page, backed by a centralized tag vocabulary and reusable badges.

• Claude Sonnet 4.6 context window increased from 200k to 1M tokens, supporting much larger inputs.
• Faster, smoother voice-to-text handoff: mode switching is now instant with no blocking revalidation between modes.

Voice dark theme is now scoped to the voice experience, preventing premature theme changes elsewhere.