Doc: add attempts doc

docs/filepicker-search.md

@@ -0,0 +1,66 @@
+# Filepicker Search Implementation - Notes
+
+## Goal
+Add `/` key functionality in filepicker (Ctrl+O) to filter/search files by name, similar to how `/` works in the main TUI textview.
+
+## Requirements
+- Press `/` to activate search mode
+- Live case-insensitive filtering
+- `../` (parent directory) always visible
+- Show "No matching files" when nothing matches
+- Esc to cancel (return to main app for sending messages)
+- Enter to confirm search and close search input
+
+## Approaches Tried
+
+### Approach 1: Modify Flex Layout In-Place
+Add search input to the existing flex container by replacing listView with searchInput.
+
+**Issues:**
+- tview's `RemoveItem`/`AddItem` causes UI freezes/hangs
+- Using `app.QueueUpdate` or `app.Draw` didn't help
+- Layout changes don't render properly
+
+### Approach 2: Add Input Capture to ListView
+Handle `/` key in listView's SetInputCapture.
+
+**Issues:**
+- Key events don't reach listView when filepicker is open
+- Global app input capture handles `/` for main textview search first
+- Even when checking `pages.GetFrontPage()`, the key isn't captured
+
+### Approach 3: Global Handler with Page Replacement
+Handle `/` in global app input capture when filepicker page is frontmost.
+
+**Issues:**
+- Search input appears but text is invisible (color issues)
+- Enter/Esc not handled - main TUI captures them
+- Creating new pages adds on top instead of replacing, causing split-screen effect
+- Enter on file item opens new filepicker (page stacking issue)
+
+### Approach 4: Overlay Page (Modal-style)
+Create a new flex with search input on top and filepicker below, replace the page.
+
+**Issues:**
+- Page replacement causes split-screen between main app and filepicker
+- Search input renders but invisible text
+- Enter/Esc handled by main TUI, not search input
+- State lost when recreating filepicker
+
+## Root Causes
+
+1. **tview UI update issues**: Direct manipulation of flex items causes freezes or doesn't render
+2. **Input capture priority**: Even with page overlay, main TUI's global input capture processes keys first
+3. **Esc key conflict**: Esc is used for sending messages in main TUI, and it's hard to distinguish when filepicker is open
+4. **Focus management**: tview's focus system doesn't work as expected with dynamic layouts
+
+## Possible Solutions (Not Tried)
+
+1. **Use tview's built-in Filter method**: ListView has a SetFilterFunc that might work
+2. **Create separate search primitive**: Instead of replacing list, use a separate text input overlay
+3. **Different key for search**: Use a key that isn't already mapped in main TUI
+4. **Fork/extend tview**: May need to modify tview itself for better dynamic UI updates
+5. **Use form with text input**: tview.Forms might handle input better
+
+## Current State
+All search-related changes rolled back. Filepicker works as before without search functionality.