fix(trade-window): drop candles under the tick replay, 65 s margin

[kirillDevPro]

What & why

The trade window (double-click a Report row) draws the trade's tick replay over one-minute bar
context. The one-minute candles were also drawn across the stretch the ticks cover, so on a
short trade two big candles sat right on top of the prints.

• The draw list now keeps only the part of each bar that lies outside tick coverage. A minute
  wholly covered by ticks drops out, a minute outside keeps the series width, and a gap the
  tick walk did not cover keeps its bar, so there is never an empty hole.
• A partial stub keeps its minute's OHLC and a proportional share of the turnover, and carries
  its own width. The candle shaders (HLSL, Metal, WGSL) now mute only a bar WIDER than the series
  timeframe, so a narrower stub keeps the series colour; the main chart only ever emits wider
  coarse bars, so it is unchanged.
• The default tick margin around a trade is 65 s (was 30 s), and 65 s is a step in the Storage
  tab. A settings file that already stores a margin keeps it.

How to verify

• cargo test -p moon-core trade_replay and cargo test -p moon-core storage::tests
• cargo test -p moon-ui-gpui --bin moonterminal trade_window and --test theme_contract
• Checked on a debug build: open a short trade and a longer one from the Report; no candle is
  drawn under the ticks, the edges show candles.