fix(summaries-slice): exclude soft-deleted measurements

The four `$queryRaw` blocks in `computeFromRollups` and
`computeFromLiveAggregate` (narrow aggregate + DISTINCT ON latest,
both fast and cold paths) folded every row regardless of
`deleted_at`. The DAY-bucket rollup aggregate is unaffected because
its source table is already filtered by the writer.

Add `AND m."deleted_at" IS NULL` to every `FROM measurements m`
WHERE clause so the slim slice's avg7/avg30/slope/r2 plus the
per-type latest never reflect a row the user soft-deleted.

src/lib/analytics/summaries-slice.ts

@@ -301,6 +301,7 @@ async function computeFromRollups(userId: string): Promise<SummariesSlice> {
         )::double precision                                           AS r2_90
       FROM measurements m
       WHERE m."user_id" = ${userId}
+        AND m."deleted_at" IS NULL
       GROUP BY m."type"
     `,
     prisma.$queryRaw<LatestRow[]>`
@@ -310,6 +311,7 @@ async function computeFromRollups(userId: string): Promise<SummariesSlice> {
         m."measured_at" AS measured_at
       FROM measurements m
       WHERE m."user_id" = ${userId}
+        AND m."deleted_at" IS NULL
       ORDER BY m."type", m."measured_at" DESC
     `,
     // v1.4.37.2 hotfix — the v1.4.35 implementation read EVERY DAY
@@ -487,6 +489,7 @@ async function computeFromLiveAggregate(
         )::double precision                                           AS r2_90
       FROM measurements m
       WHERE m."user_id" = ${userId}
+        AND m."deleted_at" IS NULL
       GROUP BY m."type"
     `,
     prisma.$queryRaw<LatestRow[]>`
@@ -496,6 +499,7 @@ async function computeFromLiveAggregate(
         m."measured_at" AS measured_at
       FROM measurements m
       WHERE m."user_id" = ${userId}
+        AND m."deleted_at" IS NULL
       ORDER BY m."type", m."measured_at" DESC
     `,
   ]);