Feat: filepicker search

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-# 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.