fix(frontend): fix find widget tooltip flicker, clipping, and close button alignment

- Prevent hover tooltip flicker by adding pointer-events:none to the
  .context-view overlay that covers trigger buttons
- Escape overflow:hidden clipping on ancestor elements by switching the
  tooltip overlay to position:fixed, with CSS custom properties
  (--cv-offset-x/y) set via ResizeObserver to translate container-relative
  coordinates to viewport-relative
- Give the find widget its own border/radius styles (no top border,
  bottom-only border-radius) since it slides from the editor top
- Adjust close button vertical position to align with action buttons

Closes #73

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/app/globals.css

@@ -1114,7 +1114,7 @@
 /* Monaco widgets: align popups/menus with shadcn surface style */
 .context-view .monaco-menu,
 .monaco-editor .suggest-widget,
-.monaco-editor .editor-widget,
+.monaco-editor .editor-widget:not(.find-widget),
 .monaco-editor .peekview-widget,
 .monaco-hover.workbench-hover {
   border: 1px solid var(--border) !important;
@@ -1122,6 +1122,34 @@
   box-shadow: 0 18px 36px -24px rgb(0 0 0 / 55%) !important;
 }
 
+/* Find widget slides from top: only bottom corners rounded, no top border */
+.monaco-editor .find-widget {
+  border-left: 1px solid var(--border) !important;
+  border-right: 1px solid var(--border) !important;
+  border-bottom: 1px solid var(--border) !important;
+  border-top: none !important;
+  border-radius: 0 0 var(--radius) var(--radius) !important;
+  box-shadow: 0 18px 36px -24px rgb(0 0 0 / 55%) !important;
+}
+
+/* Align the close button with the action buttons (prev/next match) */
+.monaco-editor .find-widget > .button.codicon-widget-close {
+  top: 9px !important;
+}
+
+/* Fix: Monaco hover tooltips are rendered in a .context-view overlay that
+   1) covers the trigger button causing mouseleave→show flicker, and
+   2) gets clipped by overflow:hidden on ancestor elements.
+   Using position:fixed escapes overflow clipping; translate corrects the
+   coordinates (inline top/left are container-relative, translate adds the
+   container's viewport offset). pointer-events:none prevents the overlay
+   from stealing mouse events from the button underneath. */
+.context-view:has(> .workbench-hover-container) {
+  position: fixed !important;
+  translate: var(--cv-offset-x, 0px) var(--cv-offset-y, 0px);
+  pointer-events: none;
+}
+
 .context-view .monaco-menu .monaco-action-bar.vertical .action-item .action-menu-item,
 .monaco-editor .suggest-widget .monaco-list-row,
 .monaco-editor .peekview-widget .monaco-list-row {

src/components/files/file-workspace-panel.tsx

@@ -1014,6 +1014,21 @@ export function FileWorkspacePanel() {
       setCursorLine(editorInstance.getPosition()?.lineNumber ?? 1)
       applyHiddenAreas()
       applyGitChangeDecorations()
+
+      // Set CSS custom properties so hover tooltips can use position:fixed
+      // to escape overflow:hidden clipping on ancestor elements.
+      const dom = editorInstance.getContainerDomNode()
+      if (dom) {
+        const syncOffset = () => {
+          const r = dom.getBoundingClientRect()
+          dom.style.setProperty("--cv-offset-x", `${r.left}px`)
+          dom.style.setProperty("--cv-offset-y", `${r.top}px`)
+        }
+        syncOffset()
+        const ro = new ResizeObserver(syncOffset)
+        ro.observe(dom)
+        editorInstance.onDidDispose(() => ro.disconnect())
+      }
     },
     [applyGitChangeDecorations, applyHiddenAreas]
   )