feat: tapes deck visualization

[bdougie]

Summary

• refresh the deck overview and session drilldown visuals with bar charts, section dividers, and refined headers
• add a split timeline/details layout to keep the drilldown navigable while surfacing message metadata and content
• apply track toggles to overview aggregates and add replay + drilldown sort controls for better analysis flow
• default deck to user/XDG SQLite paths with env overrides and coverage

Ghostty.-._code_tapes.-.1.February.2026.mp4

fixes #46

note: This PR also include changes from #45, which will need to get merged to unblock using opencode and claude code.

Testing

• go test ./cmd/tapes/deck
• go run ./cli/tapes deck --sqlite /path/to/existing/tapes.db

[jpmcb]

👏🏼 👏🏼