Refine row menu: 12px type, tighter items, icons, dedicated highlight color

Replace the Resume text on rows with an accessible ⋯ menu (Base UI): copy resume command, message, session ID

Debug panel: GPU info, benchmark against a reference machine, per-session timings

OS-specific hint to open the hidden sessions folder fast, plus Copy path

Debug: index only the 10 newest sessions (?max=N to change, ?max=0 for all)

Show the 'own tab' link once

Work without browser storage (framed Space page): index in memory, explain, never drop a session on save failure

Fix review findings: picker fallback in frames, small-index scoring, indexing retries and folder switches, media placeholders in text

Tracks V1: on-device session search with EmbeddingGemma 2

initial commit