Add UX refinements, fix crop box issue when fine rotation is enabled, add freehand analyis region.

[linkmodo]

…is region

UI/UX:

• Files sidebar: single click on a thumbnail now selects and loads it into the viewer (Ctrl/Shift click still builds a multi-selection for batch actions).
• Crop tool: double-click inside the crop box confirms the crop and closes the tool, so you no longer have to return to the Crop button.
• Right panel: collapsing the sticky "Analysis" section now pins its header at the top and hands the freed splitter space to the tabs below.
• Rename the geometry slider "Fine Rot" -> "Fine Rotation".

Fix (crop inflates under Fine Rotation):

• GeometryConfig.manual_crop_rect is now normalized in the transformed (display) image instead of raw space. get_manual_rect_coords is a plain axis-aligned slice (rect x transformed dims); previously it corner-mapped the rect through the fine rotation and took the axis-aligned bounding box, which inflated the cropped region as the tilt grew. The overlay maps screen<->rect linearly through its view rect (no uv-grid round-trip for crop). Note: manual crops saved in an older edits.db re-interpret once.

Feature (freehand analysis region, additive):

• New optional ProcessConfig.analysis_rect (transformed-normalized, like the crop rect). resolve_analysis_region turns it into the analysis ROI (buffer 0) at the single chokepoint in NormalizationProcessor and the GPU analysis path; when set it overrides the centered Analysis Buffer, otherwise the slider still applies.
• New ANALYSIS_DRAW canvas tool (draw + move + double-click confirm) plus draw/clear buttons on the Process page; the tool shows the uncropped preview.

Tests: geometry crop semantics + fine-rotation regression, analysis-region resolution + pipeline wiring, and analysis_rect serialization round-trip. make lint / type / test all pass (the one failing export-path test is a pre-existing Windows path-separator issue, unrelated to this change). Human tested the enhancements and fix to confirm they are implemented accordingly.

[linkmodo]

Tried NegPy for the first time after someone recommended it to me, what a great app for negative digitization! Made some changes to the UI to match other image editing software behaviors and fixed the crop box issue with rotation enabled. Cheers!

[marcinz606]

nice one, thanks!