Draw data labels on charts against axes, and draw funnel charts

[davidnmbond]

Found rendering Magic Suite's [List.Graph:] macro examples through the Linux DocMagic (Magic Suite ticket MS-25916). Both of these rendered nothing and reported success.

Data labels

Label text was drawn only for pies, so labelText=#VAL on a column, bar or line chart produced a chart with no labels. SeriesRenderer now labels every point of a series that has label text, placed as measured against DocMagic:

• centred just above a column, or above a line point, clear of its marker
• just beyond the end of a bar, reading outwards
• centred inside a stacked segment
• beyond the far end on the other side for a negative value

Labels are drawn in their own dataLabels group after every series, so no series covers another's labels.

Funnels

Funnel was a SeriesChartType with nothing to draw it, so a funnel came out as an empty plot with a value axis. FunnelRenderer draws the Microsoft chart control's default YIsHeight funnel: segments stacked in order with heights in proportion to their values, narrowing to a neck, each in its point colour, with labels in a right-hand column joined by leader lines. Like a pie it has no axes and its legend describes points.

Label keywords

The substitution moved out of PieSlice into DataLabelText, shared by all three. It gains #VAL, which was never substituted even for pies because it is a prefix of #VALX and #VALY, and #SERIESNAME / #SER.

Tests

DataLabelAndFunnelTests adds 13. With the renderer before this change, 12 fail; the 13th is the negative case (no label text, no labels). The full suite passes: 105 of 105. Build: 0 errors, 0 warnings.

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Up to standards ✅

🟢 Issues 0 issues

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🟢 Metrics 55 complexity · 0 duplication

Metric	Results
Complexity	55
Duplication	0

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🟢 Coverage 95.38% diff coverage · +2.12% coverage variation

Metric	Results
Coverage variation	✅ +2.12% coverage variation
Diff coverage	✅ 95.38% diff coverage

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Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (44ad0cc)	3327	2009	60.38%
Head commit (492f462)	3504 (+177)	2190 (+181)	62.50% (+2.12%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#72)	195	186	95.38%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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