Fix Workflow pages and Layout Managers crashing on a fresh install

[t0mdavid-m]

Before: when FLASHApp was run from the repository, the FLASHDeconv and FLASHTnT Workflow pages crashed with FileNotFoundError: example-data/deconv/example_lc_ms.mzML in any workspace without uploads. Both Layout Managers crashed with KeyError: st.session_state has no key "workspace" when opened by direct link or after a refresh.

After: the Workflow pages fall back to the example mzML and FASTA files that already ship in the default demo workspace, and the Layout Managers open from any link.

The example paths in src/Workflow.py pointed at example-data/deconv/ and example-data/tnt/, which are not in the repository. Fixing them revealed a third crash. When no TOPP tool has written its .ini yet, the parameter summary indexed an empty tool list, so that case is now guarded.

How: EXAMPLE_DATA and the FASTA fallback now point at example-data/workspaces/default/.../input-files/. page_setup() moves above the FileManager setup in both Layout Managers. export_parameters_markdown() checks for an empty list. The daily usability check had reported these 6 failures every day. Against this branch it passes all 26 page visits in a fresh workspace, a demo workspace and by direct link. pytest tests/ passes (52 tests), and pylint --errors-only is clean on the changed files.

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https://claude.ai/code/session_01KyJg47YNaoYnCCj1QYkHEy

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[t0mdavid-m]

pytest failed on tests/test_render_compression.py::test_nonempty_input_passes_through_binning. The cause isn't this PR's diff: requirements.txt allows polars>=1.0.0, CI now installs polars 2.0, and 2.0 removed the no-argument pl.count() that src/render/compression.py:63 calls. develop would fail the same way on its next run, because its last green pytest was on 2026-09-10. I've added edc9e2b, a one-line change to pl.len(), which has existed since polars 0.20. All 52 tests now pass locally with polars 2.0.0.

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