feat(trade): candle chart zoom, delayed selection, and fixed header layout

[Claude]

Implements pinch-to-zoom for candle charts with center-anchored scaling (1x-3x range), delayed candle detail display on press, and fixed-height header layout with smooth state transitions.

Candle Zoom

• Range: 1x (default/minimum) to 3x (maximum)
• Behavior: Scales candle body width only; spacing remains constant
• Gesture: Two-finger pinch with center-anchored zoom; single-finger actions blocked during pinch
• Sensitivity: 0.15x multiplier for smooth control

Delayed Candle Selection

• Delay: 120ms before showing candle detail on pointer down
• Cancellation: Releases, moves, scrolls, or pinch gestures cancel the pending detail display
• Display: Shows Open, High, Low, Close, Volume when triggered

Header Layout

• Fixed height: 96dp maintained across all states
• Default state: Title → Price + Icon (48dp) → Change %
• Selection state: Title + Icon (20dp) → OHLCV row
• Transition: Icon size animates 48dp ↔ 20dp without affecting container height; Price/Change hidden during selection

// Zoom scales only candle width, not spacing
val candleWidth = baseCandleWidth * zoomScale  // 6dp * [1-3]
val spacing = baseSpacing                       // 2dp constant

// Delayed selection with cancellation
val releasedBeforeDelay = withTimeoutOrNull(CANDLE_DETAIL_SHOW_DELAY_MS) {
    tryAwaitRelease()
}
if (releasedBeforeDelay != null) return@detectTapGestures

All existing behaviors preserved: loading/error/empty states, candle rendering, timeframe switching, fiat conversion.

[Claude]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• dl.google.com
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED --add-opens=java.xml/javax.xml.namespace=ALL-UNNAMED --add-opens=java.base/java.time=ALL-UNNAMED -XX:+UseParallelGC -Xmx10g -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)