Add case-insensitive path resolution for Current Path input

Walks each path component and matches against actual directory entries
when an exact match fails on Linux. Widget resyncs to the corrected
canonical path.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app.py

@@ -7,6 +7,7 @@ from utils import (
     load_config, save_config, load_snippets, save_snippets,
     load_json, save_json, generate_templates, DEFAULTS, ALLOWED_BASE_DIR,
     KEY_BATCH_DATA, KEY_PROMPT_HISTORY, KEY_SEQUENCE_NUMBER,
+    resolve_path_case_insensitive,
 )
 from tab_single import render_single_editor
 from tab_batch import render_batch_processor
@@ -54,8 +55,8 @@ with st.sidebar:
 
     def _on_path_change():
         new_path = st.session_state.nav_path_input
-        p = Path(new_path).resolve()
-        if p.exists() and p.is_dir():
+        p = resolve_path_case_insensitive(new_path)
+        if p is not None and p.is_dir():
             st.session_state.current_dir = p
             st.session_state.config['last_dir'] = str(p)
             save_config(st.session_state.current_dir, st.session_state.config['favorites'])