doc: Document missing 1.2 release notes information

[sureshchouksey8]

Missing Release Notes Information for FreeCAD 1.2 Release Notes

This PR documents missing user-facing features and bug fixes across the Draft, PartDesign, and Sketcher workbenches for the FreeCAD 1.2/1.0 release cycle. All entries cite their source pull requests in the upstream FreeCAD/FreeCAD repository.

Draft Workbench Changes Documented:

• BIM Wall Draft Editing support (FreeCAD/FreeCAD#29860): Base-less walls created in the BIM workbench are now directly Draft-editable.
• Annotation Style JSON extensions (FreeCAD/FreeCAD#30358): Saving annotation styles now guarantees that the file has a .json extension.
• Draft ShapeString Task Panel coordinates preservation (FreeCAD/FreeCAD#29762): Point coordinates manually entered are no longer overwritten by mouse movements.
• Hints for Annotation Tools (FreeCAD/FreeCAD#29649): Added on-screen hints for Draft annotation tools to guide user input.

PartDesign Workbench Changes Documented:

• UpToShape Extrusion complex target body logic (FreeCAD/FreeCAD#29686): Fixed the UpToShape pocket and pad extrusion logic when computing against complex geometric target bodies.
• Chamfer Tool Selection Mode initialization (FreeCAD/FreeCAD#29313): Starting the Chamfer tool now correctly activates selection mode immediately upon GUI initialization.
• TwoLengths Pad expression migration (FreeCAD/FreeCAD#29247): Fixed Length and Length2 expression migration handling for TwoLengths pad parameters.

Sketcher Workbench Changes Documented:

• Line Style Dropdown rendering (FreeCAD/FreeCAD#30151): Fixed the line style dropdowns in the task panel showing empty selections upon starting.
• Task Panel label consistency (FreeCAD/FreeCAD#29556): Improved text labeling consistency in the task panel by renaming "Change Value" to "Edit Value".

[Reqrefusion]

Do not add T tags yourself; only modify the files in the wiki root directory, do not touch the translation files. Please check the latest version and ensure that the information you are adding has not been added previously. Also, be sure to cite the source of your change. Regression corrections should not be added to the documentation. And it should never contain information that the end user shouldn't know. "It's working as it should" isn't enough to be included. The reasons for each change made, along with their sources, should be explained individually.

[sureshchouksey8]

Hi @Reqrefusion, I have updated this PR to fully address your feedback.

Specifically:

1. No Translation Tags: I have removed all manually added translate blocks and T tags. No translation files (like /de/) are touched. All edits are made strictly to the English wiki root files.
2. Removed Dev-Cycle Regressions: I stripped all developer-facing regression notes, internal code references (like getMovableChildren), and simple "working as it should" placeholders.
3. Upstream Source Citations: I cited the specific upstream pull requests from the FreeCAD/FreeCAD repository for every user-facing feature/bug-fix documented, along with the user impact.
4. Clean & Rebased: The branch is rebased cleanly on the latest origin/main branch with no merge conflicts, and is ready for your review and merge.

You can verify the updated commit history and the updated PR description above for full details. Let me know if any other adjustments are needed!