VS-08 Analysis Vertical Slice v1 (One Chart + Filter + Quota Display)

[CherryClairette]

What to build

Implement a first analysis journey where a user selects a filter, sees one meaningful chart, and gets role-aware quota feedback. This slice proves the data-to-insight flow and monetization limitation messaging in one coherent path.

Acceptance criteria

• User can apply at least one analysis filter and see chart update
• Quota status is visible and understandable for free users
• Premium users are not blocked by free-tier quota limitation
• Empty, loading, and API error states are handled
• Analysis slice is covered by tests for role and quota scenarios

Blocked by

VS-06 Authorization Gate v1 (Free vs Premium)
VS-07 Map Vertical Slice v1 (Base Map + One Premium Layer)