[codex] Filter transactions by chart bucket

[tobomobo]

What changed

• Added transparent click targets across each active transaction chart bucket so clicking a month/week slice filters the table to that whole bucket.
• Kept existing bar-segment clicks intact for segment-specific filters such as Incoming or Swaps.
• Extended the chart selection model to support an all-flows bucket filter and added regression coverage for its label and matching behavior.

Why

The chart previously only filtered when users clicked an actual bar segment. Sparse months with tiny or no visible bars were hard to target, even though the visible chart bucket suggested the whole slice should be interactive.

Validation

• pnpm --dir ui-tauri run typecheck
• pnpm --dir ui-tauri exec eslint src/components/transactions/dashboard/TransactionWorkbench.tsx src/components/transactions/dashboard/model.ts src/components/transactions/dashboard/model.test.ts
• pnpm --dir ui-tauri exec vitest run src/components/transactions/dashboard/model.test.ts src/components/transactions/model.test.ts
• Browser smoke on /transactions?period=1year: slice click produced Chart: Mar 26 · All flows · All; bar click still produced Chart: Apr 26 · Incoming · All
• ./scripts/quality-gate.sh

[tobomobo]

@codex

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Respect chart mode for bucket-wide selections

When a bucket is selected via the new segment: null path, matchesFlowChartSelection returns true immediately after date matching, so flow filtering is skipped entirely. In external chart mode this means clicking a bucket can include transfer/swap rows that were not part of the visible chart slice, even though the selection carries mode: "external" and the chip label implies that context. This creates a misleading filter result for users who clicked the external-only view.

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