Revert "file_finder: Remove common segments of long paths in search results (#25049)" (#25163)

This reverts commit 9ef0501853 due to a
panic.

```
{
  "thread": "main",
  "payload": "9 is not a valid char boundary in path \"crates/…/LiveKitBridge/\"",
  "location_data": {
    "file": "crates/file_finder/src/file_finder.rs",
    "line": 646
  }
}
```

Release Notes:

- N/A

crates/assistant/src/terminal_inline_assistant.rs

@@ -702,6 +702,7 @@ impl Focusable for PromptEditor {
 impl PromptEditor {
     const MAX_LINES: u8 = 8;
 
+    #[allow(clippy::too_many_arguments)]
     fn new(
         id: TerminalInlineAssistId,
         prompt_history: VecDeque<String>,