fix(windtrends): never show negative wind speed on the axis

[mairas]

The Wind Trends speed axis is built symmetric around the running average (avg ± 2 steps). In light wind the lower half of that window falls below zero, so the widget draws negative TWS ticks. Wind speed has no negative values, so the axis should never reach there.

The lower bound is now clamped to 0 and the window is shifted up by the same amount, so the span and the four tick intervals are unchanged.

That shift exposed a second bug in the same area: the centre guideline and its big label were drawn at (min + max) / 2, which stops being the average once the window is shifted off zero. On a 0–4 m/s axis with a 0.4 m/s mean the line sat at 2 m/s. The guideline now draws at the cached average on both axes, falling back to the midpoint only before any data has arrived.

Three tests cover the behaviour: the shifted window at a 0.4 kt average with a 2 kt spread, the unchanged average-centred window at 12 kt, and the guideline staying on the average while the window is shifted. The guideline test was mutation-checked against the midpoint version and fails there.

Verified on the water: deployed to a device with light-wind data, where the axis starts at 0 and the bold mean line sits on the actual mean. Full suite 2166 tests pass; lint clean.

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📝 Walkthrough

Walkthrough

The wind-trends graph now clamps negative speed-axis bounds to zero while preserving four tick intervals. The component stores the shifted window midpoint for styling. Tests cover shifted light-wind ranges and centered positive ranges.

Changes

Wind speed axis

Layer / File(s)	Summary
Axis bounds and validation src/app/widgets/widget-windtrends-graph/widget-windtrends-graph.component.ts, src/app/widgets/widget-windtrends-graph/widget-windtrends-graph.component.spec.ts	The speed axis clamps its minimum to zero, preserves a four-interval span, and stores the resulting window midpoint. Tests expose the computed scale and verify shifted and centered ranges.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Merge Risk: 🔵 Low · up to 9ae9c

Correct the misleading axis comment before merging; the graph behavior and tests otherwise address the stated change.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title uses conventional-commit form and clearly states the main change: preventing negative wind-speed values on the axis.

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Actionable comments posted: 1

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Inline comments:
In
`@src/app/widgets/widget-windtrends-graph/widget-windtrends-graph.component.ts`:
- Line 1063: Update the explanatory comment near the wind-speed axis bounds to
state that the logic preserves a four-interval window without negative ticks,
and that light-wind ranges shift upward from zero rather than centering on
lastAverage Speed. Do not claim the axis remains centered on the average.

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📥 Commits

Reviewing files that changed from the base of the PR and between 534db27 and 9ae9ca2.

📒 Files selected for processing (2)

• src/app/widgets/widget-windtrends-graph/widget-windtrends-graph.component.spec.ts
• src/app/widgets/widget-windtrends-graph/widget-windtrends-graph.component.ts

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