feat: session work column enhancements — Files Changed editing + project-wide Preview with PDF and TeX support

[jeonghun-jj-lee]

Closes #721

Session work column enhancements

Implementation of the 9-slice feature DAG for #721.

Dependency DAG (5 frontiers)

Frontier	Issues
F0	#722 (mode toggle), #724 (dropdown search), #725 (project file tree)
F1	#723 (save infra), #726 (renderer dispatch)
F2	#727 (PDF rendering), #728 (read-write text)
F3	#729 (TeX compilation)
F4	#730 (SyncTeX forward search)

Phase 1 (complete)

• Added pdfjs-dist to opencode fork (v1.18.10-amicode.20)
• Extracted buildCollapsedTree to shared utils/collapsed-tree.ts
• Extracted ZoomControl to shared components/zoom-control.tsx
• Re-extracted overlay

In progress

Walking the DAG frontier by frontier...

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