feat: Style presets

[Vibhuti410]

Closes #106

Changes

• Added Builder Style Preset DocType to manage presets from the desk with style_name, style_map (JSON) and sort_order fields
• Added a Style select field in the Typography panel to apply the presets on text blocks
• Fields that are controlled by the preset shows the value as a placeholder (inherited)
• Also can manually override a field and when we clear that, the fields automatically takes back the preset value

New Files Added

• stylePreset.ts — added this to fetch all style presets from the DocType
• presetUtils.ts — added this to get the active preset's style map to avoid repetition and can be just imported wherever useful

Changes In Existing Files

• TypographySection.ts — added the Style preset dropdown here
• StylePropertyControl.vue — extended this to handle preset inheritence for all style fields
• blockController.ts — added getPresetStyle and setPresetStyle methods here
• block.ts — added presetStyle property to keep track of which preset is applied on a block

Demo:

Screen.Recording.2026-03-12.at.12.44.31.PM.mov

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.49%. Comparing base (b4c1f00) to head (f1efc6b).

Files with missing lines	Patch %	Lines
...ctype/builder_style_preset/builder_style_preset.py	0.00%	4 Missing ⚠️
...ilder/builder/doctype/builder_page/builder_page.py	40.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #519      +/-   ##
===========================================
- Coverage    63.56%   63.49%   -0.07%     
===========================================
  Files           27       29       +2     
  Lines         2791     2805      +14     
===========================================
+ Hits          1774     1781       +7     
- Misses        1017     1024       +7     

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