Add live disk analysis, model previews, and navigation improvements

[terrorproforma]

This brings the outstanding local work into master: compact tab overflow, safe ZIP Extract Here, local STL/STEP previews, and live disk analysis that starts automatically and scans all entries by default. Disk maps show allocated space, stream progress, retain unmapped drive use, and preserve zero allocation for sparse files.

Also preserves in-progress path edits during pane refreshes, gives drive buttons a readable minimum width, refreshes vulnerable dependency patches, ignores local editor/backup files, and documents the changes.

Validation:

• Native and renderer builds; Go test/vet; privacy and brand checks.
• Native helper, analyzer performance/cancellation/UI, STL/STEP previews, ZIP extraction, compact tabs, pane navigation, responsive layout, security boundaries, transactional operations, and SEO discovery checks passed.
• The new path-edit regression reproduced the failure before the fix and passed afterward. The model cleanup test now waits for the asynchronous dialog close handler.
• npm audit reports zero vulnerabilities.
• The legacy Windows PowerShell ConPTY smoke fails on this machine on both the original master and this branch. Command Prompt passes locally; Windows CI exercises PowerShell 7 and must pass before merge.