refactor(search): unify dropdown filtering on the shared ranked matcher

Branch, project, agent, model, provider, stash, SSH-host, skill-catalog
and archive filters each had their own toLowerCase().includes (or no
ordering at all); the git branch and gitmoji pickers also let cmdk
re-filter and reorder on top of the manual filter, silently dropping
rows. All of them now go through rankByQuery/matchesRankQuery: results
are relevance-ordered, multi-word queries match in any order, matching
ignores punctuation, and cmdk filtering is disabled where the ranked
list is already final. rankBranchesForQuery keeps relevance order
instead of re-sorting matches alphabetically; the model picker now also
matches model ids.

packages/ui/src/lib/search/fuzzySearch.ts

@@ -41,54 +41,6 @@ export function matchesFuzzyQuery(
   return fuse.search(query).length > 0;
 }
 
-function getFuzzyMatchMask<T>(
-  items: T[],
-  query: string,
-  getText: (item: T) => string,
-  options?: FuzzySearchOptions
-): boolean[] {
-  if (!query) {
-    return items.map(() => true);
-  }
-
-  const mergedOptions = { ...DEFAULT_FUZZY_OPTIONS, ...options };
-  const queryLower = query.toLowerCase();
-  const matches = new Array(items.length).fill(false);
-  const fuzzyCandidateTexts: string[] = [];
-  const fuzzyCandidateIndices: number[] = [];
-
-  for (let i = 0; i < items.length; i++) {
-    const target = getText(items[i]);
-    if (!target) {
-      continue;
-    }
-
-    if (mergedOptions.preferSubstring && target.toLowerCase().includes(queryLower)) {
-      matches[i] = true;
-      continue;
-    }
-
-    fuzzyCandidateTexts.push(target);
-    fuzzyCandidateIndices.push(i);
-  }
-
-  if (fuzzyCandidateTexts.length === 0) {
-    return matches;
-  }
-
-  const fuse = new Fuse(fuzzyCandidateTexts, {
-    threshold: mergedOptions.threshold,
-    distance: mergedOptions.distance,
-    ignoreLocation: mergedOptions.ignoreLocation,
-  });
-
-  for (const result of fuse.search(query)) {
-    matches[fuzzyCandidateIndices[result.refIndex]] = true;
-  }
-
-  return matches;
-}
-
 /**
  * Score-sorted fuzzy ranking. Strict (low threshold), prioritizes substring
  * matches (especially prefix matches), and returns the top N.
@@ -271,23 +223,3 @@ export function matchesRankQuery(
   return tokens.every((token) => scoreRankToken(token, rankFields) !== RANK_TOKEN_MISS);
 }
 
-export function partitionByFuzzyQuery<T>(
-  items: T[],
-  query: string,
-  getText: (item: T) => string,
-  options?: FuzzySearchOptions
-): { matching: T[]; other: T[] } {
-  const matches = getFuzzyMatchMask(items, query, getText, options);
-  const matching: T[] = [];
-  const other: T[] = [];
-
-  for (let i = 0; i < items.length; i++) {
-    if (matches[i]) {
-      matching.push(items[i]);
-      continue;
-    }
-    other.push(items[i]);
-  }
-
-  return { matching, other };
-}

packages/ui/src/lib/worktrees/branchSearch.test.ts

@@ -0,0 +1,33 @@
+import { describe, expect, test } from 'bun:test';
+
+import { rankBranchesForQuery } from './branchSearch';
+
+describe('rankBranchesForQuery', () => {
+  test('empty query keeps everything in the other groups', () => {
+    const result = rankBranchesForQuery({ localBranches: ['main'], remoteBranches: ['origin/dev'], query: ' ' });
+    expect(result.matching).toEqual([]);
+    expect(result.otherLocal).toEqual(['main']);
+    expect(result.otherRemote).toEqual(['origin/dev']);
+  });
+
+  test('orders matches by relevance, not alphabetically', () => {
+    const result = rankBranchesForQuery({
+      localBranches: ['aaa-fix-scroll', 'fix/scroll', 'main'],
+      remoteBranches: ['origin/fix/scroll-old'],
+      query: 'fix',
+    });
+    expect(result.matching[0]).toEqual({ label: 'fix/scroll', value: 'fix/scroll', source: 'local' });
+    expect(result.matching.map((entry) => entry.label)).toEqual([
+      'fix/scroll',
+      'aaa-fix-scroll',
+      'origin/fix/scroll-old',
+    ]);
+    expect(result.otherLocal).toEqual(['main']);
+    expect(result.otherRemote).toEqual([]);
+  });
+
+  test('remote matches carry the remotes/ checkout value', () => {
+    const result = rankBranchesForQuery({ localBranches: [], remoteBranches: ['origin/feat/x'], query: 'feat' });
+    expect(result.matching[0].value).toBe('remotes/origin/feat/x');
+  });
+});

packages/ui/src/lib/worktrees/branchSearch.ts

@@ -1,4 +1,4 @@
-import { partitionByFuzzyQuery } from "@/lib/search/fuzzySearch";
+import { rankByQuery } from "@/lib/search/fuzzySearch";
 
 export interface RankedBranchGroups {
   matching: Array<{
@@ -26,42 +26,19 @@ export function rankBranchesForQuery(args: {
     };
   }
 
-  const localPartition = partitionByFuzzyQuery(localBranches, normalizedQuery, (branch) => branch);
-  const remotePartition = partitionByFuzzyQuery(remoteBranches, normalizedQuery, (branch) => branch);
-  const matching: RankedBranchGroups['matching'] = [];
-  const otherLocal = localPartition.other;
-  const otherRemote = remotePartition.other;
-
-  for (const branch of localPartition.matching) {
-    matching.push({
-      label: branch,
-      value: branch,
-      source: 'local',
-    });
-  }
-
-  for (const branch of remotePartition.matching) {
-    matching.push({
-      label: branch,
-      value: `remotes/${branch}`,
-      source: 'remote',
-    });
-  }
-
-  matching.sort((a, b) => {
-    const byLabel = a.label.localeCompare(b.label, undefined, { sensitivity: 'accent' });
-    if (byLabel !== 0) {
-      return byLabel;
-    }
-    if (a.source !== b.source) {
-      return a.source.localeCompare(b.source);
-    }
-    return a.value.localeCompare(b.value);
-  });
+  // Rank local and remote branches together so the order reflects match
+  // quality (an exact or prefix match lands first), not the source group or
+  // the alphabet.
+  const candidates: RankedBranchGroups['matching'] = [
+    ...localBranches.map((branch) => ({ label: branch, value: branch, source: 'local' as const })),
+    ...remoteBranches.map((branch) => ({ label: branch, value: `remotes/${branch}`, source: 'remote' as const })),
+  ];
+  const matching = rankByQuery(candidates, normalizedQuery, (branch) => [branch.label]);
+  const matched = new Set(matching);
 
   return {
     matching,
-    otherLocal,
-    otherRemote,
+    otherLocal: candidates.filter((entry) => entry.source === 'local' && !matched.has(entry)).map((entry) => entry.label),
+    otherRemote: candidates.filter((entry) => entry.source === 'remote' && !matched.has(entry)).map((entry) => entry.label),
   };
 }