feat(trees): Keep file-tree search open and interactive

[necolas]

Before, a file-tree search was a temporary mode. It closed as soon as the user clicked a row or pressed Enter, and the user could not change which directories the search expanded. Now the search stays open, and the user can work inside the results.

What the user can now do

• Click a row and keep the search open. A click selects the row and leaves the search open. The user can select several results and refine the query.
• Press Enter and keep the search open. Enter selects the focused match and leaves the search open. Focus stays in the search input, so the user can select more matches without a new search.
• Collapse a directory in the results. During a hide-non-matches search, the user can collapse a matched directory to hide its matches. The search keeps that choice until the user clears the search.

How it works

Each commit is a self-contained change:

1. Keep search open after a row click — the click plan returns closeSearch: false.
2. Keep search open when the user presses Enter — the Enter handler selects the focused match and no longer closes the search. The inline rename path (F2) still closes the search and restores the scroll.
3. Let the user collapse directories during search — the controller keeps a set of the directories the user collapsed. Each search refresh keeps them collapsed but still visible, filters the visible rows from that state, prunes stale directories, remaps them through tree mutations, and clears the set when the search closes. The controller now tracks matches outside the visibility pass, so match navigation still uses the full match set.

Source of the change

These commits port the @pierre/trees patch from the diffy project into the TypeScript source. The original patch changed the built dist/, so this PR applies the same behavior to src/. The upstream patch also carried an expand/reveal override, but @suveshmoza confirmed it is not needed, so this PR drops it and keeps only the reachable collapse behavior. This PR also updates the affected tests and adds a controller test for the collapse override.

Test plan

• moon run root:format root:lint
• moonx trees:typecheck
• moonx trees:test
• moonx trees:test-e2e

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[chatgpt-codex-connector]

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[necolas]

cc @suveshmoza

[necolas]

Codex correctly flagged that the expand override is not reachable in hide-non-matches search. Example:

src/
  utils/
    worker.ts   (matches "worker")
    stream.ts   (no match)
  components/   (no match)

Searching worker shows only src/ › utils/ › worker.ts. Clicking utils/ (already open) can only collapse it, and stream.ts / components/ are not rendered, so there is no row to click that would expand a folder and reveal its non-matching files. The expand half of the override map — and the reveal loop in #syncSearchVisibilityState — is plumbed but has no trigger in this mode. The collapse direction works and is reachable.

I kept the code faithful to the diffy patch and reworded the PR and commit to describe only the reachable (collapse) behavior.

@suveshmoza was a trigger for the expand/reveal intended as a follow-up or could that path be dropped?

[suveshmoza]

It can be dropped

[necolas]

Dropped the expand/reveal path per @suveshmoza. The override is now a plain Set of collapsed directories (collapse-only): I removed the expand branch from toggleMountedDirectoryFromInput, the reveal loop in #syncSearchVisibilityState, and the expand handling in #refreshActiveSearchState, and simplified the map to a set. The reachable collapse behavior is unchanged.

Renamed the test to file-tree-search-manual-collapse.test.ts and reworded the PR and commit. Force-pushed; moonx trees:test (327) and moonx trees:test-e2e (58) pass.