feat: dashboard decision_level surfacing -- amber unclassified badge + filter (#76 part 1)

[Knapp-Kevin]

Summary

Read-side UI for decision_level in assets/dashboard.html. Pre-existing L1/L2/L3 badges (shipped in #71 / CodeGenome Phase 1+2) are untouched; this PR adds the missing amber Unclassified state for NULL decision_level rows plus a top-bar filter dropdown so reviewers can scope the ledger view to a single level (or to the unclassified backlog).

• .lvl-unclassified CSS class -- amber rgb(249, 115, 22), sibling of .lvl-l1 / .lvl-l2 / .lvl-l3.
• renderDec branch for null decision_level -- emits lvl-unclassified badge labeled Unclassified and stamps the row with data-level="unclassified".
• Each decision row now carries data-level="L1"|"L2"|"L3"|"unclassified" and the decision-row class.
• New <select id="lvl-filter"> in the topbar (All / L1 / L2 / L3 / Unclassified) wired to a new client-side applyLevelFilter(value) helper.
• HTML-pattern tests in tests/test_dashboard_unclassified_rendering.py -- six assertions covering CSS, render branch, dropdown markup, filter function. The render path is inline JS, so the tests assert against the source-of-truth template rather than booting a DOM.

Part 1 of 2

Phase 6 of the original plan (inline-edit POST endpoint) is deferred to a follow-up PR. That endpoint calls ledger.queries.update_decision_level, which is being added in the sibling classifier PR (#77 / feat/decision-level-classify-77). Once that helper lands on dev, part 2 ships and closes the remaining slice of #76.

No server changes

Pure HTML/CSS/JS edit plus one new pytest module. No touches to classify/, cli/, handlers/, ledger/queries.py, contracts.py, or server.py -- those are the sibling classifier PR's surface.

Test plan

• pytest tests/test_dashboard_unclassified_rendering.py -v -- 6 passed in 0.67s
• python -c "from dashboard.server import get_dashboard_server" -- imports clean
• ruff check . -- clean
• ruff format --check . -- 164 files already formatted
• mypy tests/test_dashboard_unclassified_rendering.py -- no issues
• Browser spot-check (out-of-band; not blocking PR open)

Labels

flow:feature -- read-side UI surfacing existing classifier output.

Refs

• Refs Dashboard: surface decision_level + "unclassified" badge for legacy NULL rows #76 (part 1 of 2)
• Sibling: Tooling: bulk-classify utility for legacy decision_level = NULL rows #77 / feat/decision-level-classify-77 (provides update_decision_level for part 2)

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