chore(release): bump version to v2.17.0 and rebuild frontend distribution

[spelech]

Release v2.17.0

Highlights

• Hybrid Scoring Calibration & Modes: Dynamic dense_weight calibration ($\alpha \in [0.0, 1.0]$) and explicit search modes (hybrid, semantic, lexical) with full score decomposition across Qdrant, Chroma, and PGVector.
• AST Structural Context Enrichment: SQLite ast_symbols query integration populating signatures, clean AST kinds, and container paths into search payloads and MCP markdown headers.
• Search Inspector UX Overhaul: Full code chunk preservation, 3-way mode segmented control, interactive weight slider with presets, repo datalist, score chips, and 1-click Open in Navigator bridge.
• Codebase Navigator Enhancements: Sub-bar omni-search, ambient scope tinting, aggregated container caller impact, and history-safe navigation.
• Automated Test Baseline: 1023 automated tests (backend, frontend, E2E) with 100% pass rate.