fix(tradingagents): clarify reports and remove unused budgets

[TNT-Likely]

Background

Agent notifications did not identify the stock being analyzed. Deep-analysis reports omitted their saved date and displayed dollar amounts derived from assumed token counts and fixed model prices; the monthly budget inherited those inaccurate amounts. The README introduction also lacked alignment with its Trending badge, and screenshots appeared after the setup instructions.

Changes

• Notifications: include the stock name and symbol in single-stock Agent titles across the inbox, preview, toast, and report dialog. Persist identity for new notices and recover it for legacy notices without changing read or archive state.
• Reports: show the saved report date, generated timestamp, and actual provider-reported input/output/total Tokens. Mark incomplete usage explicitly, retain the latest cumulative usage beyond the 500-entry progress history limit, and remove heuristic dollar amounts from report UI, share cards, and newly generated report footers. Cached reports no longer claim to have been generated today.
• Budget removal: remove the monthly budget panel, configuration controls, API query/endpoint, estimates, and execution checks. Accept and ignore legacy budget settings so model/debate/timeout configuration continues to work. Keep cooldown and trading-session guards.
• UI and documentation: restore opener focus for controlled dialogs while respecting custom focus handoffs. Center the bilingual README introduction/navigation/badges, move the existing screenshot section before core features, and update the existing flow documentation for budget removal. Preserve Trending, demo, and screenshot assets.

Validation

• .venv/bin/python -m pytest -q — 945 passed, 3 skipped; existing deprecation warnings.
• .venv/bin/python -m pytest -q tests/test_tradingagents_usage.py tests/test_tradingagents_agent.py tests/test_notifications.py — 70 passed after final test organization and documentation cleanup.
• pnpm --dir frontend exec vitest run — 203 passed across 51 files.
• pnpm --dir frontend check:i18n, check:ui, check:market-colors, and build — passed. Local Node 24.19.0/pnpm 9.15.9; the repository pins Node 24.14.0. Existing engine/chunk-size warnings remain.
• git diff --check and XML parsing of both flow diagrams — passed.
• Chrome checks using temporary component fixtures: report, notification preview, and idle modal at 1440/390 px in light/dark themes (12 variants), including scroll, focus containment, Escape, opener focus, historical date, stock identity, partial usage, and absence of budget/fee labels.
• GitHub Markdown API rendering plus browser layout checks for both READMEs at desktop/mobile widths in light/dark themes (8 variants); unchanged module contents, badge targets, local links, anchors, and folds verified.

Boundaries and risks

• Historical reports without recorded usage display “not recorded”; missing provider usage is not treated as zero or estimated billing. Legacy raw cost fields and existing saved report bodies remain for compatibility.
• The monthly budget endpoint is retired and legacy budget limits no longer block manual or automatic deep analysis.
• Legacy notification stock names can be recovered only while a matching, unambiguous stock exists; newly published notices retain the name after stock deletion.
• Browser validation used isolated component fixtures and GitHub-rendered Markdown with a local style wrapper, not an authenticated production end-to-end session. No paid analysis or real notification delivery was triggered for validation.

Follow-up

User acceptance of the report, notification, and README presentation before merging.