refactor(games): unify recent win/loss chip across games

[netqo]

Summary

Unifies the recent win/loss indicator across the games so it looks the same
everywhere (except Roulette), matching Coinflip's lettered chip. Extracts a
shared WinLossChip and RecentResultsStrip and wires Coinflip, Mines, Crash
and Blackjack to them.

Rationale

The four games each had their own recent-results strip: Coinflip and Mines drew
a tinted, bordered chip with a W / L letter; Crash drew a plain solid square with
no label; Blackjack drew a solid-fill chip with a white W / L / P letter. They
were visually inconsistent for the same concept.

The new WinLossChip(tone: OutcomeTone) reuses the existing OutcomeTone
(Win / Loss / Push) enum and renders the Coinflip style; RecentResultsStrip
wraps the "Recent" header and the chip row. Each screen now maps its result list
to OutcomeTone and calls the shared strip, deleting its local
RecentStrip / RecentChip / HistoryChip. Net -30 lines.

Roulette is intentionally left untouched: its strip shows colored pocket numbers
(0-36), not a win/loss outcome, so the shared chip does not apply.

Verification

• ./gradlew :app:compileDebugKotlin (green)
• ./gradlew :app:ktlintMainSourceSetCheck (green)
• ./gradlew :app:detekt (green)
• ./gradlew :app:installDebug -- built and installed on a physical device.

On-device screenshots of the Crash/Blackjack strips are pending (the test device
was in active use); the chip is the same shared composable already shown working
on Coinflip.

Test plan

• Compile + ktlint + detekt clean.
• Visually confirm Coinflip / Mines / Crash / Blackjack recent strips render
  the identical W / L / P chip on device; confirm Roulette is unchanged.

Related issues

Checklist

• Commit messages follow Conventional Commits.
• Branch name follows the naming convention (refactor/).
• The change is scoped: only the shared chip extraction and the four screens.
• User-visible behavior changed (Crash/Blackjack chip restyle), so CHANGELOG.md is updated under [Unreleased].
• No new dependency was added.