fix(charts): preserve declared series marker styling

[developer0hye]

Summary

Preserve a chart series marker's declared size, fill, opacity, and outline separately from the plotted series. The budget workbook's selected-period marker previously became a small orange circle because only its symbol was parsed. It now renders as the declared 14pt teal circle with a 0.75pt outline. Plot markers and legend keys share the styling across line, area, combo, and radar charts; absent settings retain existing defaults.

Related: #1185. Remaining independent marker placement and paint-order defects are tracked in #1577 and #1578.

Testing

• Captured failing real-workbook size and parser paint-isolation regressions before implementation. All 36 focused marker tests pass, including size boundaries, invalid values, suppressed paint, multiple chart families, and legend keys.
• Initial candidate full workspace: 3,478 tests passed; workspace clippy with -D warnings, formatting, and diff checks passed. After integrating the baseline portability follow-up, all 2,846 library tests, workspace clippy, and a locked CLI build pass. The rebuilt PDF has a complete two-page trace identical to the reviewed marker candidate, excluding the PDF filename.
• Native Excel one-factor controls cover marker sizes 2, 8, 14, and 28pt, red and suppressed fills, and a 2pt outline. No-patch exports are layout-identical. Native's raster canvas includes padding; comparisons use the declared point size and visible ink rather than treating the canvas as the vector diameter.
• Page 1 is unchanged at 150 DPI; page 2 changes 1,887 pixels inside a 49x49-pixel marker region at 300 DPI. One fill operation becomes the styled fill plus outline; all other 920 fill/stroke operations remain unchanged.
• Normalized native/before/after text matches on both pages (486 and 2,120 non-whitespace characters). All 55 page-1 and 480 page-2 material clusters have explicit dispositions.

Baseline: 7ffaefeb78e5d45d6be0330ee3554b4b3f8ac8d8, including the separate category-baseline correction. The recorded before PDF was built at 9ba2c7150a992e66df7790ceeebe3f2ede0976d2; its complete two-page trace is identical to the follow-up baseline. Fixture SHA-256: 2b4a2d8dceda58758593c88409875efbda05780559154c02bd13fef4f7a1c65b; Cargo.lock SHA-256: 750f50c507b281f84b945b09573333ffa02dc45cddd566481af8535ae101e612.

Reference: Open XML SDK's marker child model separates symbol, size, and shape properties; c:size is an integer from 2 through 72 points.

Reproduce with cargo run --locked -p office2pdf-cli -- tests/fixtures/xlsx/issue_1181_fit_to_height.xlsx -o output.pdf --font-path '/Applications/Microsoft Excel.app/Contents/Resources/DFonts'. Run compare_layout.py GT.pdf output.pdf --audit --fine-shift 0.5 --json and compare_render.py GT.pdf output.pdf --page P --dpi DPI --fine-shift 0.5 --cluster-report PATH --cluster-dispositions PATH --strict-clusters for both pages (150 and 300 DPI respectively).

Visual impact

• Rendered PDF change or visual evidence added

Visual audit

• Issue: Charts: a series marker's c:size and its own spPr fill are dropped, so a 14pt accent1 circle prints as a 5pt palette dot #1185
• Fixture: tests/fixtures/xlsx/issue_1181_fit_to_height.xlsx (SHA-256 2b4a2d8dceda58758593c88409875efbda05780559154c02bd13fef4f7a1c65b)
• Page(s): 1, 2
• Renderer and DPI: pdftoppm at 150 DPI for page 1 and 300 DPI for page 2; MuPDF trace geometry
• Evidence mode: fix
• Layout audit report: assets/bugfixes/issue-1185/layout-audit.json
• Render cluster reports: assets/bugfixes/issue-1185/render-clusters-page-1.json, assets/bugfixes/issue-1185/render-clusters-page-2.json
• Reference exporter differences: None
• Fine-detail threshold: 0.5pt
• Layout audit page count: Pass
• Layout audit text flow: XLSX: fitted fixed-row cell baselines sit up to 2.16pt above Excel on the budget sheet #1545, XLSX: wrapped Trebuchet MS 10pt lines advance 11.89pt instead of Excel’s 13pt #1551
• Layout audit visible fills: Pass
• Layout audit rectangle geometry: XLSX: an anchored chart's frame sits 12.4pt right of the native export's and 1.9% narrow #1272, XLSX: the Arial 18pt auto title row prints 28pt instead of Excel’s 24pt #1550
• Layout audit large shifts: Pass
• Layout audit fine shifts: XLSX: an anchored chart's frame sits 12.4pt right of the native export's and 1.9% narrow #1272, XLSX charts: fitted drawing foreground keeps the physical page origin #1542, XLSX: fitted fixed-row cell baselines sit up to 2.16pt above Excel on the budget sheet #1545, XLSX: the Arial 18pt auto title row prints 28pt instead of Excel’s 24pt #1550, XLSX: wrapped Trebuchet MS 10pt lines advance 11.89pt instead of Excel’s 13pt #1551, XLSX: a mixed-size Aptos footer remains 0.78pt above its native baseline #1552
• New follow-up issues found in this audit: XLSX: worksheet chart markers omit native raster placement #1577, Charts: category-axis rule paints over an opaque series marker #1578
• Model vision findings: Inspected both full GT/output pages and pixel diffs, all 64 matched fine-shift crops, the marker size/fill/outline probe crops, and the final JPEG. The selected-period circle grows from the 5pt default to its declared 14pt and uses its own teal fill and 0.75pt outline; native Excel rasterizes this marker, while output retains vector edges. Page 1 is pixel-identical; page 2 changes 1,887 pixels confined to the marker. The other 920 fill/stroke operations are unchanged. Existing text seating, chart-frame displacement, worksheet rule thickness, and missing separator lines remain tracked below. The larger marker exposes stale cached-value placement (XLSX: worksheet chart markers omit native raster placement #1577) and an axis rule overpainting opaque fill (Charts: category-axis rule paints over an opaque series marker #1578); both have separate issues and native controls. All 535 material clusters have explicit reviewed dispositions.
• GT: assets/bugfixes/issue-1185/gt.jpg
• Before: assets/bugfixes/issue-1185/before.jpg
• After: assets/bugfixes/issue-1185/after.jpg
• Native: None
• Compare: None

Visual comparison

Native Excel 16.112.3 exports, verified Excel/Quartz PDF provenance. Page 2 at 300 DPI:

GT	Before	After

The unchanged page-1 native comparison is attached to #1550, #1551, and #1552.

Required inspection

• Rendered all evidence at 150 DPI or higher
• Stored progressive JPEG quality 86 assets with metadata stripped
• Used Codex/Claude vision to inspect the full GT/output pages, diff, and matched crops
• Inspected matched region crops at full resolution
• Ran compare_layout.py --audit --fine-shift PT and dispositioned every fine/large text-instance shift, rectangle geometry deviation, painted-text visibility mismatch, and visible-fill occlusion
• Ran compare_render.py --cluster-report PATH --strict-clusters and dispositioned every material 5% fuzz diff cluster by explicit ID
• Inventoried hairlines and border dash styles
• Inventoried font weight, italic, and underline emphasis

Deviation audit

Check	Result
Page count/order	Matches GT: two printable sheets retain their native order.
Element presence	Remaining: #1566 omitted worksheet separator lines. Fixed: declared marker size, fill, and outline.
Position/size	Remaining: #1272 chart frame, #1542 fitted drawings, #1545 fixed-row text, #1550 title-row height, #1552 footer position. Remaining: #1577 stale cached marker value. Marker styling follows its declared size.
Rotation/flip	No deviation observed: no transform changes.
Fill	Remaining: #1578 axis overpainting opaque marker fill. Fixed: the marker uses its own declared teal fill.
Stroke/border	Remaining: #1578 axis overpainting; #1566 omitted worksheet separator lines; #1564 fitted worksheet rule thickness/placement. Fixed: declared marker outline width and paint. Declared chart-line opacity remains 25% and 50%, matching native. Gray table hairlines, teal total rules, and brown category rules retain their paths; no dashed or dotted source rules are lost.
Shape outline geometry	Remaining: #1272 chart frame and #1550 title-band height. Fixed: marker circle uses the declared 14pt size. Other path operations retain geometry and paint.
Text content	Matches GT after whitespace normalization of pdftotext -layout; all label/value characters are preserved; the source month categories also retain their significant trailing space.
Font family/weight/style	Matches GT: the existing Cambria major-theme category font is preserved. Bold Cambria section headings, bold Trebuchet expense headings, Arial bold instruction title, and Aptos footer retain their emphasis. No italic or underlined runs are changed.
Text color	Matches GT: chart labels and worksheet text retain their colors.
Alignment	Remaining: #1542 drawing labels, #1545 row text, #1550 first-page content, #1552 footer baselines. Remaining: #1577 stale cached marker value.
Line/paragraph spacing	Remaining: #1545 fixed-row seating and #1551 wrapped note line pitch.
Clipping/overflow	No deviation observed: no new clipping or overflow; native and output both display ##### in the narrow annual-total cells.