CP-14874: change deposit options to 25%/50%/Max percentages

[bogdandobritoiu]

Description

Ticket: CP-14874

• Switches the perps deposit quick-amount buttons from fixed $100/$250/$500 to percentages 25% / 50% / Max of the wallet's C-Chain USDC balance, by dropping the presets override so TokenUnitInputWidget falls back to its built-in percentage buttons.
• Fixes a Max rounding bug this surfaced (also reproducible on withdraw today): both perps screens stored value.toDisplay({ asNumber: true }) — 4-decimal round-half-up — as the amount, so Max on e.g. a 44.148877 USDC withdrawable became 44.1489 and was rejected with "Maximum withdrawal is 44.15 USDC". Amounts are now quantized at exact USDC precision via toSubUnit() (floors; also drops the fractional subunits percentage presets produce, which parseUnits(…, 6) would reject), and the withdrawable→balance conversion floors instead of rounding.
• No k2-alpine changes; scoped to the perps deposit/withdraw screens plus a small shared utils/usdcAmount.ts helper.

Screenshots/Videos

Pending device verification — will add iOS/Android captures.

Testing

Dev Testing

• Trade → Perpetuals → Deposit: quick-amount buttons show 25% / 50% / Max; tapping each fills the proportional amount of your wallet USDC balance; amounts below the 5 USDC minimum show the existing inline error with the Deposit button disabled.
• Deposit → tap Max: no "Insufficient USDC balance" error; button enables once a quote resolves.
• Perpetuals → Withdraw → tap Max: fills the full withdrawable without the spurious "Maximum withdrawal is X USDC" error (previously reproduced whenever the withdrawable's 5th/6th decimal rounded the 4th up).
• Bitrise dev build: pipeline #9376

QA Testing

• Deposit quick amounts are percentages of the wallet USDC balance (25%, 50%, Max = 100%); fixed dollar presets are gone.
• Max on both deposit and withdraw must be accepted (button enabled once quoted) for balances with 5–6 decimal places, e.g. 44.148877 USDC.
• Typing an amount above the balance/withdrawable still shows the respective error and keeps the button disabled.

Checklist

Please check all that apply (if applicable)

• I have performed a self-review of my code
• I have verified the code works
• I have included screenshots / videos of android and ios
• I have added testing steps
• I have added/updated necessary unit tests
• I have updated the documentation

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Updates the perps deposit/withdraw amount handling so quick-amount buttons use percentage presets (25% / 50% / Max) and “Max” amounts are kept at exact USDC precision (avoiding display-rounding that can exceed available balances).

Changes:

• Removes fixed $100/$250/$500 deposit presets so TokenUnitInputWidget falls back to its built-in 25%/50%/Max buttons.
• Introduces shared USDC amount helpers and applies them to deposit/withdraw to avoid 4-decimal display rounding on submit.
• Adds Jest coverage to lock in the precision behavior for both screens.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/core-mobile/app/new/features/trade/perpetuals/utils/usdcAmount.ts	Adds helper functions to quantize TokenUnit inputs and floor withdrawable balances to USDC precision.
packages/core-mobile/app/new/features/trade/perpetuals/screens/PerpetualsWithdrawScreen.tsx	Uses flooring + quantization helpers so “Max” never exceeds withdrawable due to rounding.
packages/core-mobile/app/new/features/trade/perpetuals/screens/PerpetualsWithdrawScreen.test.tsx	Adds tests ensuring Max/percentage amounts aren’t display-rounded and withdrawable is floored.
packages/core-mobile/app/new/features/trade/perpetuals/screens/PerpetualsDepositScreen.tsx	Removes fixed deposit presets and quantizes widget output to USDC precision.
packages/core-mobile/app/new/features/trade/perpetuals/screens/PerpetualsDepositScreen.test.tsx	Adds tests ensuring default percentage presets are used and amounts are floored/precise.
docs/superpowers/specs/2026-07-22-cp14874-deposit-percentage-presets-design.md	Documents design/behavior notes for percentage presets + precision fix.
docs/superpowers/plans/2026-07-22-cp14874-deposit-percentage-presets.md	Documents implementation plan for the change.

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[github-actions]

Coverage report ✅

2/2 packages passed thresholds
Thresholds are shown inline against each package baseline.

🟢 @avalabs/core-mobile

St.	Category	Percentage	Covered / Total
🟢	Statements	27.94% (+9.94% vs 18% ▲)	12338/44150
🟢	Branches	23.59% (+11.59% vs 12% ▲)	6056/25664
🟢	Functions	22.23% (+9.23% vs 13% ▲)	2267/10195
🟢	Lines	28.02% (+10.02% vs 18% ▲)	11816/42158

🟢 @avalabs/k2-alpine

St.	Category	Percentage	Covered / Total
🟢	Statements	7.62% (+5.62% vs 2% ▲)	270/3539
🟢	Branches	7.02% (+6.02% vs 1% ▲)	151/2148
🟢	Functions	4.52% (+3.52% vs 1% ▲)	37/817
🟢	Lines	7.07% (+5.07% vs 2% ▲)	230/3251

Artifacts and threshold sources

• @avalabs/core-mobile: summary core-mobile/coverage/coverage-summary.json, thresholds core-mobile/coverage-thresholds.json
• @avalabs/k2-alpine: summary k2-alpine/coverage/coverage-summary.json, thresholds k2-alpine/coverage-thresholds.json

Source run: Mobile PR

[Copilot]

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

packages/core-mobile/app/new/features/trade/perpetuals/screens/PerpetualsWithdrawScreen.tsx:242

• Even with usdcAmountFromTokenUnit preventing the stored amount from being 4dp display-rounded, TokenUnitInputWidget still sets the input field text from quick-amount button presses using valueUnit.toDisplay({ asNumber: true }), which rounds to 4 decimals. That means tapping Max/percent can still show a rounded-up value in the input UI that doesn’t match the exact amount this screen submits. Fix likely belongs in the shared widget (TokenUnitInputWidget / TokenUnitInput) so it sets/syncs the exact display string (e.g. toDisplay()).

        <TokenUnitInputWidget
          sx={{ width: '100%' }}
          autoFocus
          token={USDC_TOKEN}
          balance={availableBalance}
          amount={amount > 0 ? toUsdc(amount) : undefined}
          onChange={handleAmountChange}
          formatInCurrency={formatInCurrency}
          valid={!exceedsBalance}
        />