David Blanc Brioir f6000de230 feat: Add force_hierarchical mode to prevent fallback ...

## Changes

Allow users to force hierarchical search mode without fallback to simple
search, enabling testing of hierarchical UI even when 0 summaries are found.

**Backend (flask_app.py):**
- Added `force_hierarchical` parameter to `hierarchical_search()`
- When True, never fallback to simple search (return empty hierarchical result)
- Added `fallback_reason` field to explain why no results
- Pass `force_hierarchical=True` when `force_mode == "hierarchical"`
- Applied to all fallback points:
  - No Weaviate client
  - No summaries found in Stage 1
  - No sections after author/work filtering
  - Exception during search

**Frontend (templates/search.html):**
- Display warning message when `fallback_reason` exists
- Yellow alert box with explanation and suggestions
- Works even when `results_data.results` is empty

## Usage

1. Select "🌳 Hiérarchique (2-étapes)" in Mode dropdown
2. Enter any query (even if no matching summaries)
3. See hierarchical UI with warning instead of fallback

## Example

Query: "Qu'est-ce que la justice ?" (not in Peirce corpus)
- Mode forced: Hierarchical
- Result: 0 sections, warning displayed
- No silent fallback to simple search

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

2026-01-01 14:24:44 +01:00

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