Fix Meteor LRPT, global timezone, VDL2 correlation, and weather sat UX

[mitchross]

Summary

• Fix Meteor LRPT decoding in Docker — missing pipeline data, FFTW3 libs, and arm64 path handling
• Global timezone/12h-24h setting — site-wide time preference in Settings > Display, applied across all modes
• Fix VDL2 messages not appearing in aircraft datalink panel — nested field flattening and ICAO case mismatch
• Fix ACARS message display — add weather, CPDLC, squawk rendering; use global timezone
• Enhanced weather satellite UX — getting started guide, pass geometry panel, wider predictions, demo data mode
• Fix clock flickering — duplicate setInterval timers on index.html and nav.html

Changes

Docker (Dockerfile)

• Add libfftw3-double3 and libfftw3-single3 runtime dependencies for SatDump
• Add missing COPY --from=builder /staging/usr/local/share/ (pipeline definitions were never reaching runtime)
• Handle arm64 vs x86 install path differences (/usr vs /usr/local)
• Split SatDump compile and staging into separate layers for faster rebuilds
• Build-time assertions to catch missing pipelines early

Weather Satellite UI

• Getting Started guide (what are Meteor satellites, step-by-step, when to look, what you need)
• AOS/TCA/LOS pass geometry detail panel with times, bearings, cardinal directions
• Pass analysis bar (24h quality breakdown, best upcoming pass)
• Enhanced pass cards with AOS/LOS times, bearings, BEST badge, direction arrows
• Console timestamps, log level filters (ALL/SIGNAL/PROG/ERR), copy/clear buttons
• Countdown pulse animation when pass is imminent
• "All Meteor Satellites" default dropdown (was single-satellite only)
• Demo data mode for UI testing without SDR hardware
• Meteor M2-4 80k baud fallback pipeline option
• Widened prediction window to 48h at 5° min elevation
• Fix duration display (was showing seconds labeled as minutes)

Global Time Preferences

• InterceptTime utility in core/utils.js (timezone + 12h/24h format)
• Settings > Display > Time & Timezone (UTC, Local, Eastern, Central, Mountain, Pacific)
• Header nav clock uses selected timezone and format across all pages
• Weather satellite, ACARS, VDL2 sidebar all respect global setting

ADS-B / ACARS / VDL2

• Fix VDL2 messages not appearing in aircraft detail panel (nested field flattening, ICAO uppercase)
• Add weather, CPDLC, squawk parsed data rendering to ACARS cards
• Show tail/registration alongside flight number
• Fix engine_data crash when parsed value isn't an object
• INTERCEPT_DISABLE_AUTH env var for local/dev use

Clock Fix

• Fix flickering between UTC and ET caused by duplicate setInterval timers
• Inline updateHeaderClock in index.html was still using raw UTC

Test plan

• Docker build succeeds on arm64 (RPi5) and x86
• docker exec intercept satdump --help runs without missing library errors
• ls /usr/local/share/satdump/pipelines/ shows 71 pipeline JSON files
• Weather Sat mode shows pass predictions when location is set
• Pass geometry panel appears when a pass is selected
• Settings > Display > Timezone changes update clock and all time displays instantly
• No clock flickering on any page
• VDL2 messages appear in aircraft datalink panel when clicking a VDL2 message
• ACARS messages show weather/CPDLC/squawk parsed data

🤖 Generated with Claude Code

[smittix]

Thanks for the PR — there's a lot of good work here. The Dockerfile split into compile/staging layers is a genuine fix for the missing pipeline issue, and the InterceptTime module is well-structured. Before we can merge, there are two issues that need addressing:

Required fixes

1. updateTimelineLabels() — ReferenceError at runtime

In static/js/modes/weather-satellite.js, the new updateTimelineLabels() function references selectedTimezone and TZ_MAP directly, but those variables no longer exist after the InterceptTime refactor. This will throw a ReferenceError whenever a timezone is selected or passes are loaded.

Fix: replace the raw variable references with the InterceptTime API already used correctly elsewhere in this PR:

const tz = typeof InterceptTime !== 'undefined' ? InterceptTime.getTimezone() : 'UTC';
const ianaName = typeof InterceptTime !== 'undefined' ? InterceptTime.getIANA() : undefined;

2. docker-compose.yml — profiles: [basic] on the intercept service breaks existing deployments

Adding profiles: [basic] to the intercept service means plain docker compose up -d starts nothing. Anyone using the documented docker compose --profile basic up -d workflow will be fine, but users who run the bare docker compose up -d will get a silently empty deployment.

The intercept service should remain unconditional (no profiles: block), consistent with how the service worked before this PR.

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Other notes (not blocking)

• Clock flicker fix — app.js doesn't check _navClockStarted before starting its own interval, so the duplicate-timer scenario may still partially occur on the main SPA page.
• INTERCEPT_DISABLE_AUTH — works correctly, but a startup app.logger.warning() when the flag is active would help prevent accidental use in a deployed environment.
• INTERCEPT_IMAGE removal — silently breaks users pulling a pre-built registry image (e.g. via build-multiarch.sh). Worth documenting if intentional.
• Min elevation — 5° is at the horizon with maximum atmospheric attenuation; most users won't get a usable decode at that angle. 10° would be a better default.
• "24h passes" label — the analysis bar header still says "24h passes" but the fetch window is now 48h.
• VDL2 — data['addr'] is set redundantly alongside data['icao']; can be removed if not consumed downstream.
• Default timezone — defaulting to US/Eastern will surprise non-US users; UTC would be a more neutral default.

Fix the two required items and this is ready to go.