Rework the mobile create-workspace source picker to be a faithful port of
desktop's Smart picker instead of the earlier divergent "Start from" drawer.
The mobile field is now the workspace-name input AND the source search, with the
exact desktop tabs — Smart · GitHub · Linear · GitLab · Branch · Name. "Smart"
fans out across GitHub + GitLab + Linear + branches, prepends a "Use '<name>'"
row, and resolves pasted URLs / #123 / STA-42 to exact items (with a cross-repo
switch prompt). Selecting a source shows a pill and moves the editable name into
Advanced. The invented "Blank workspace" concept is removed — the neutral state
is just a typed/empty name (blank submit still yields a creature name).
DRY: the pure desktop logic (smart-workspace-source-results, -command-value,
github-links, gitlab-links, work-item-link-query-bounds, github-work-item-identity)
moves to src/shared/new-workspace/ with re-export shims at the old renderer paths,
so both renderer and mobile share one implementation. composer-branch-selection
and workspace-name were already shared and are reused directly.
Two read-only lookup RPCs are allowlisted for mobile so pasted GitLab URLs and
cross-repo GitHub URLs resolve to exact items (github.workItemByOwnerRepo,
gitlab.workItemByPath).
New mobile modules are split for max-lines: use-mobile-composer-source (selection
state + desktop-parity handlers, PR/MR base resolve), use-smart-workspace-source
+ smart-source-fan-out/-search-requests/-paste-intent (RPC orchestration),
composer-linked-work-item / work-item-lookup-text / mobile-smart-source-modes
(pure logic), and SmartWorkspaceSourceField/Drawer/Row + SmartWorkspaceAdvancedFields.
Replaces WorkspaceSourcePickerDrawer/Row, workspace-source-selection,
use-workspace-source-search, and MobileWorkspaceNameInput.
Reviewed by three adversarial agents + re-reviewed after fixes: GitHub search now
returns issues AND PRs (not issues-only), Linear defaults to assigned, create-branch
preserves slashy names, cross-repo PR base resolves against the item's own repo,
displayName is suppressed for user-edited names, and the smart-mode GitHub fan-out
respects availability. tsc/oxlint/max-lines-ratchet clean; 1328 mobile tests pass.
