DAO: simplify proposal filters and align count badges

[dnlbui]

What Changed

This PR keeps the complete DAO proposal-filter set visible and aligns their count badges.

• Removes the filter overflow container and expand/collapse control from the DAO modal.
• Renders all eight filter chips in a shared four-column grid while preserving tab selection, proposal counts, headings, and accessible labels.
• Simplifies the proposal detail presentation for options and vote-result meters, including compact deadline labels.

Fixed Flow

1. Open the DAO modal.
2. Every proposal state filter is immediately visible; no expansion control is required.
3. Select a filter to update the active chip, heading, count, and proposal list.
4. The fixed toolbar keeps filters available while the proposal list scrolls.

Why

The former overflow layout hid several proposal states behind an expand control. A shared grid makes the full state set immediately scannable and keeps badges consistently aligned across rows.

Validation

• node --check app.js
• node --test tests/dao-filter-layout.test.mjs
• git diff --check 20ecbf42b3ee7920a2a69484bac78033ba41d655

Closes #1561