Defect 1: the typed GitLab MR search query was dropped before reaching
the API. Thread query?: string end-to-end through the renderer effect,
the source-lookup, the preload/RPC args, and the desktop IPC handlers
(which previously passed a hardcoded undefined), and honor it on both the
glab REST path (&search=) and the cwd-inferred 'glab mr list' fallback.
Defect 2: when MR base resolution failed the renderer silently returned,
leaving baseBranch undefined so the worktree was created off the repo
default branch (origin/master) with no feedback. Surface the failure via
toast and clear stale base state, mirroring the GitHub PR path. Also make
resolveManagedMrBase resilient to an optional compare-base (target branch)
fetch failure: degrade gracefully by dropping compareBaseRef instead of
aborting, so a merged MR with a deleted target ref still resolves to its
valid source-branch base.
Fixes#6263
Co-authored-by: Orca <help@stably.ai>
31bfeff01d