docs: add session log for log analyzer build

.claude-context/sessions/2026-01-19-log-parsing-print-report.md

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+# Log Analyzer with Time-Only Timestamp Parsing and Print Report
+
+**Date:** 2026-01-19
+**Project:** video-player-log-analyzer
+**Status:** resolved
+**Tags:** html, javascript, chart.js, log-parsing, regex, reporting, moonlight-drive-in
+
+## Context
+Jess wanted a way to see how the Moonlight Drive-In player is actually used — what gets played, when, and how often — from the player's log files, plus a printable activity report. The first version parsed nothing useful: its regexes expected full date-time stamps, but the player logs only contain time-of-day.
+
+## Key Decisions
+- **Single self-contained HTML file** — open locally in a browser, load log files, no server or install. Fits a Windows host with no dev tooling.
+- **Verify the real log format before writing parsers** — logs use `HH:MM:SS.mmm` with no date; the date is taken from the log **filename** (or scanned from content) instead.
+- **Group by date *and* hour** — earlier charts aggregated everything into one set of hourly totals, hiding day-to-day patterns.
+- **Chart.js** for charts — simple, CDN-loadable, good enough for dashboards.
+- **Dedicated print report** with print-friendly styling rather than printing the dashboard as-is.
+
+## Technical Details
+- File: `video_player_log_analyzer.html` (HTML + inline JS/CSS, Chart.js).
+- Input: Moonlight player log files; date derived from filename, time from each line.
+- Views: statistics dashboard, interactive charts (hourly activity per date), video playback analytics, print-ready activity report.
+
+## Code Changes
+- `video_player_log_analyzer.html` — new; parser, dashboards, charts, print report.
+- `README.md` — usage docs.
+
+## Open Questions / Next Steps
+- Parsing is tied to the current log line format — if the player's logging changes, update the regexes first.
+- Possible: include NFC client / LEGO Dimensions portal events once those log to the same place.
+
+## Artifacts
+- `3786959` — Initial commit - Video Player Log Analyzer with comprehensive print report feature
+- Related repo: https://gitea.hideawaygaming.com.au/jessikitty/moonlight-drive-in