feat: add support_interface_min_area

[bluetianyu]

Summary

Introduces a user-configurable option support_interface_min_area (minimum support contact area) that exposes the minimum_roof_area threshold — previously hardcoded to 1 mm² in the tree support paths — and lowers its default to 0.25 mm².

Background / Motivation

Tree supports tend to generate many tiny roof / interface fragments under small overhangs. These fragments extrude unstably, give poor support performance, and add slicing noise. The area threshold was previously hardcoded (1 mm²) in both the node-based and organic tree implementations, with no way to tune it per machine / material / use case. This PR promotes it to a visible setting, letting users balance keeping more precise small contact patches against dropping fragmented contacts in favor of normal support.

Option details

Field	Value
Key	support_interface_min_area
Type	coFloat (f_enum_open — preset values + free input)
Unit	mm²
Default	0.25 (was hardcoded 1.0)
Presets	0 / 0.25 / 0.64 / 1
Min	0 (0 = no filtering, keep all contact surfaces)
Mode	Advanced
Category	Support
Meaning	Roof polygons smaller than this value are not generated as interface and fall back to normal support. Lower value → more (and more fragmented) contact surfaces; higher value → fewer, more consolidated contact surfaces.

Changes

1. Definition & propagation

• PrintConfig.hpp / PrintConfig.cpp: declare and define support_interface_min_area (label / tooltip / sidetext / enum / default).
• Node-based tree TreeSupport.cpp / TreeSupport.hpp: minimum_roof_area changed from const 1.0 to a value read from config.
• Organic tree TreeSupportCommon.hpp: TreeSupportMeshGroupSettings::minimum_roof_area is read from config; default 1.0 → 0.25.

2. Full UI / config integration

• Preset.cpp: added to the print preset options whitelist (ensures save/load).
• PrintObject.cpp: added to invalidate_state_by_config_options so changing the value triggers a re-slice.
• Tab.cpp: added to the Support → Advanced → Interface settings page.
• ConfigManipulation.cpp: show/hide the field with the support toggle.
• GUI_Factories.cpp: added to the per-object settings list and visible options.
• Field.cpp: wrapped sidetext in _L() so it is localizable.

3. Localization: .pot template + all 20 language .po files translated (one label + one tooltip each); verified with msgfmt --check-format.

Scope & behavior change ⚠️

• This option only affects tree supports (organic / slim / strong / hybrid) roof/contact filtering; the normal (grid) support path is not affected.
• Default lowered from 1.0 mm² to 0.25 mm²: existing tree-support presets will slice differently after upgrade (more small contact surfaces are retained by default). To fully preserve old behavior, set the value to 1 (or 0 to disable filtering entirely).
• Backward compatible with existing project files: when the key is absent, the default (0.25) is used.

Verification

• ✅ Builds cleanly (deps + slicer).
• ✅ All .po files compiled to .mo via scripts/run_gettext.bat; --check-format passes.
• Suggested regression: compare tree-support generation for 0 / 0.25 / 1 on models with fine overhangs (e.g. Benchy mast/chimney, cantilever test parts) and check removability.

Files (32)

• 10 C++ files (option definition + tree threshold wiring + UI/config integration)
• 22 localization files (.pot + 20 .po; zh_CN.po includes context lines)

default.mp4

[github-actions]

❌ Documentation validation failed

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📄 doc/developer-reference\Built-in-placeholders-variables.md:

• Line 93: home#process-settings - Fragment does not exist
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📄 doc/developer-reference\How-to-wiki.md:

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📄 doc/Tab.cpp:

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🖼️ Image Validation Errors

📄 doc/developer-reference\How-to-create-profiles.md:

• Line 142: [Markdown] Alt text "Help menu" ≠ filename "go-to-configuration-folder"
• Line 144: [Markdown] Alt text "Delete system folder" ≠ filename "profile-delete-system-folder"

[github-actions]

❌ Documentation validation failed

🔗 Link Validation Errors

📄 doc/developer-reference\Built-in-placeholders-variables.md:

• Line 93: home#process-settings - Fragment does not exist
• Line 93: home#material-settings - Fragment does not exist

📄 doc/developer-reference\How-to-wiki.md:

• Line 44: home#material-settings - Fragment does not exist
• Line 45: home#process-settings - Fragment does not exist
• Line 46: home#prepare - Fragment does not exist
• Line 47: home#calibrations - Fragment does not exist
• Line 50: home#process-settings - Fragment does not exist
• Line 50: home#support-settings - Fragment does not exist
• Line 50: home#others-settings - Fragment does not exist

📄 doc/Home.md:

• Line 14: Precise-wall.md - File does not exist
• Line 17: extrusion-rate-smoothing.md - File does not exist
• Line 33: adaptive-pressure-advance.md - File does not exist

📄 doc/Tab.cpp:

• Line 2373: fill-patterns - File does not exist
• Line 2376: fill-patterns - File does not exist
• Line 2558: multimaterial_settings_prime_tower#brim-chamfer - Fragment does not exist
• Line 2559: multimaterial_settings_prime_tower#brim-chamfer-max-width - Fragment does not exist
• Line 2571: multimaterial_settings_prime_tower#wall-gap - Fragment does not exist
• Line 2585: multimaterial_settings_ooze_prevention#delta-temperature - Fragment does not exist

🖼️ Image Validation Errors

📄 doc/developer-reference\How-to-create-profiles.md:

• Line 142: [Markdown] Alt text "Help menu" ≠ filename "go-to-configuration-folder"
• Line 144: [Markdown] Alt text "Delete system folder" ≠ filename "profile-delete-system-folder"