fix(ui): keep drag-over state stable across nested drop-zone elements

[seonghobae]

Current exact authority — 2026-09-06

• protected base: main@47c6fd27de13b0da37a7db64697b869941909351
• exact head: 2793248abed72a3c0accd0c584ff77f793395dd8
• lifecycle: Draft / source repair present / repository-wide Palette doctrine removed / browser evidence and hosted gates pending
• effective protected-base delta: saas_web.py only

Product finding

The existing drop-zone handlers add .dragover on dragenter/dragover and remove it on every dragleave. Moving a dragged file between the drop zone and nested label/input descendants can therefore make the parent observe leave/enter transitions even though the pointer has not left the overall drop target, producing unstable highlight state.

The branch introduces per-zone nesting state: dragenter increments dragCounter, dragleave decrements it and clears .dragover only at zero, and drop resets both counter and visual state. Single-file and batch zones share the same setup path.

Scope repair

The generated predecessor also appended a blanket dragCounter prescription to .jules/palette.md. That repository-wide doctrine was not necessary to express this product-local interaction repair. Normal descendant 2793248abed72a3c0accd0c584ff77f793395dd8 restores .jules/palette.md byte-for-byte to protected main; no force push or destructive rebase was used.

Remaining acceptance

There is no current-head behavioral browser/E2E evidence yet, so the visual claim is not promoted as complete. Before Ready, exercise both single and batch drop zones in a real browser with at least: enter from outside, movement across nested label/input descendants, leave to outside, drop, and a second drag after drop. Verify .dragover does not flicker or stick, counter state resets between gestures, native file selection remains unchanged, and keyboard/form behavior is unaffected.

Fresh exact-head CI, fuzz, Security Scan, SAST Semgrep and CodeQL PR runs are newly materialized and non-terminal. Predecessor results do not transfer.

Delivery Gate

• 의도성: PASS — visual drag state maps directly to an active drop-zone gesture.
• 기능 완전성: PARTIAL — source state machine exists; real-browser nested-element/drop/re-entry evidence is missing.
• 콘텐츠 적합성: PASS — generated repository-wide Palette doctrine is no longer in the effective delta.
• 복원력: PARTIAL — single/batch source parity exists; browser leave/drop/reset behavior is not yet evidenced.
• 증거성: FAIL / PENDING — exact-head hosted workflows and current-browser evidence are non-terminal/missing.
• 고유성: N/A — interaction-state bug fix, not a brand-expression change.

No Ready/merge promotion until one unchanged exact head satisfies the material UI evidence, hosted security/CI gates, current review threads, and independent non-author review. No self-approval, bypass, source-neutral retrigger, gate weakening, force push, or destructive rebase.

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