feat(ui): complete Plan 06-01 - fix model scan + move model selector to input

- Fix Rust model scan to only list top-level models (not subdirectories)
- Add scan_model_dir_top_level() function in model_files.rs
- Create ModelSelectorPill component for chat input area
- Remove model-section from Sidebar, move to ChatView
- Update ChatView props to receive model-related props
- Update tests for new ChatView props

.planning/phases/06-chat-ui-redesign/06-01-TASK1-SUMMARY.md

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+# Task 1 Summary: Fix Rust model scan to top-level only
+
+**Status:** ✅ Complete
+**Files Modified:**
+- `tauri-app/src-tauri/src/model_files.rs`
+
+## Changes Made
+
+### 1. Added `scan_model_dir_top_level` function (lines 46-71)
+A new function that scans only the immediate children of a directory (depth=1), returning only `.gguf` files without recursing into subdirectories.
+
+### 2. Updated `scan_model_dir` to use top-level scan (lines 31-44)
+Changed from calling `scan_model_dir_recursive` to calling `scan_model_dir_top_level` as the default behavior.
+
+### 3. Kept `scan_model_dir_recursive` for future use (lines 73-97)
+The recursive function is preserved with `#[allow(dead_code)]` annotation for potential future use cases.
+
+### 4. Updated tests
+- Renamed `scan_model_dir_finds_gguf_in_subdirectories` to `scan_model_dir_returns_only_top_level_gguf`
+- Updated assertion to expect only top-level models
+- Added new test `scan_model_dir_recursive_finds_nested_gguf` to verify the recursive function still works
+
+## Verification
+
+```bash
+cd tauri-app/src-tauri && cargo test scan_model
+```
+
+All 5 tests pass:
+- `scan_model_dir_filters_and_sorts_gguf_files` ✅
+- `scan_model_dir_ignores_directories_named_like_models` ✅
+- `scan_model_dir_skips_hidden_directories` ✅
+- `scan_model_dir_recursive_finds_nested_gguf` ✅
+- `scan_model_dir_returns_only_top_level_gguf` ✅
+
+## Success Criteria Met
+
+- ✅ `scan_models` Tauri command returns only `.gguf` files in the immediate directory
+- ✅ Nested models in subdirectories are excluded from default scan
+- ✅ Recursive scan function remains available for future use
+- ✅ All existing tests continue to pass