feat: SQLite-backed local store, per-source progress UI, taxonomy per…

[HugoMSFT]

…sistence

Local persistence:

• Add src/local_store.py: thread-safe SQLite store (feedback + state tables, JSON list serialisation, CSV export/import, legacy CSV seeding).
• Replace ad-hoc in-memory state with the LocalStore on every collection run; CSV becomes a snapshot, the DB is the source of truth.

CSV exports:

• Reorder TABLE_COLUMNS so Sources and Url are columns 2 and 3 (right after Feedback_ID); previously buried at columns 5 and 29.

Taxonomy long-term persistence:

• Save keywords / categories / impact_types to data/.json (writable) instead of src/.json. Cascading load order: data/ -> src/ -> in-code defaults.
• Customizations survive application restarts, PyInstaller frozen builds (read-only src/), and source-tree upgrades.

Collection progress drawer:

• Add per-source state tracking (pending / running / success / error / skipped) on the server with a lock-protected helper, surfaced via SSE.
• Replace the static 4-card grid in index.html with a dynamic per-source list rendered from collection_status.source_states; includes status badges, spinner for running, item counts, and a summary line.
• Mark still-running / pending sources as "error" if the run aborts so the drawer never shows a stuck spinner.

.env handling:

• Rewrite .env.template to match the variable names actually read by config.py (REDDIT_, GITHUB_TOKEN, ADO_, optional Fabric / Flask).

Frozen build (PyInstaller 6+):

• Add src/ to spec pathex and pin module hiddenimports so run_web / app / config / etc. resolve at runtime.
• Update runtime_paths._select_source_dir to probe sys._MEIPASS/src and PROJECT_ROOT/_internal/src layouts.
• start_feedback_collector.py reconfigures stdout / stderr to UTF-8 (errors='replace') so emoji-laden log lines don't crash on cp1252-redirected streams.