feat: add manual Y-axis range controls with auto fallback

[JavaZeroo]

Motivation

• Provide a way to manually lock the chart Y-axis while keeping the default automatic scaling behavior.
• Allow partial manual overrides (only min or only max) and an easy way to revert to automatic scaling to avoid breaking existing workflows.

Description

• Added global yRange state in App and passed it into RegexControls and ChartContainer to expose UI and rendering hooks for Y-axis control.
• Implemented a Y-axis panel in RegexControls with min/max inputs and an Auto button that clears manual bounds and returns to automatic scaling.
• In ChartContainer added getFinalYScale which merges manual yRange with the computed automatic nice scale and safely falls back to auto when manual bounds are invalid; the same logic is applied to comparison charts.
• Added i18n keys in public/locales/en/translation.json and public/locales/zh/translation.json for the new UI labels and hints.

Testing

• Ran the test suite with npm test -- --run and all tests passed (13 test files, 57 tests).
• Ran lint with npm run lint and it completed successfully with an existing unrelated warning about react-refresh/only-export-components.

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Codex Task

[github-actions]

PR Preview Action v1.8.1
Preview removed because the pull request was closed.
2026-04-20 06:52 UTC

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve raw Y input text until value is complete

Parsing e.target.value with Number(...) on every keystroke drops intermediate numeric states ("-", "0.", etc.), so users cannot reliably type negative or decimal Y bounds; the control snaps to empty/integer values before the input is complete. This breaks manual range entry for common datasets (especially comparison/relative values) unless users paste the full number in one shot.

Useful? React with 👍 / 👎.

[chatgpt-codex-connector]

Recompute Y tick step after overriding min/max

After applying manual bounds, this function keeps autoScale.step unchanged while replacing min/max, so the chart can use a step size that no longer matches the displayed range. In practice, widening bounds (for example from an auto range near 0..1 to a manual max in the thousands) can produce extremely dense ticks and hurt chart readability/performance.

Useful? React with 👍 / 👎.