Warn when limit/stop increase may be liquidatable at trigger price FEDEV-2399

[qwinndev]

Warns users when a Limit Increase / Stop Increase order that increases an existing position would be liquidatable at its trigger (execution) price, so they can add collateral or reduce leverage before it triggers.

Linear: https://linear.app/gmx-io/issue/FEDEV-2399

Behavior

• Warn (non-blocking) for a resting Limit/Stop Increase on an existing position when the simulated resulting position would be liquidatable at the trigger price — submit/update stays enabled. Shown in the tradebox and the order editor (and via the editor that a chart-line drag opens).
• Block (unchanged) remains the existing Market Increase guard (liquidatable at the mark price).
• The check compares the next-position liquidation price against the trigger price (execution price) rather than the current mark price.

Changes

• getIsPositionLiquidatableAtPrice shared helper (+ unit tests).
• Tradebox increase liquidation guard scoped to Market Increase only (!isLimit); new selectTradeboxIncreaseLiquidationRiskWarning selector.
• Shared LiquidatableIncreaseWarningCard, reused in the tradebox and the order editor.
• Order editor computes the warning inline (non-blocking); the chart-line drag path is unchanged, so the warning surfaces in the editor it opens.
• Warning copy translated across all locales.

Out of scope

• Dynamic volatility / near-liquidation distance buffers (FEDEV-3906).
• Failed-order LiquidatablePosition messaging and the Market Increase block copy (already implemented).

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[qwinndev]

Superseded by #2582 (branch renamed to fedev-2399-liquidatable-increase-warning for readability).