feat(dashboard): add a Today overview to the hero

The hero led with the first sentence of the cached briefing, which was
often a greeting ("Good morning.") while the sentence with content was
never shown. Without an AI provider it fell back to "Your health score
today is N.", which the hero then removed because the ring already
shows the number, leaving a ring and "Nothing needs your attention".

The daily digest now publishes the lead resolved on the server and a
short list of facts about the day:

- lead: the reaction line or the first briefing sentence that is not a
  greeting and does not repeat the score while AI text is available,
  otherwise a deterministic sentence about the strongest signal (a vital
  outside its personal range, a night an hour off the usual, vitals in
  range, last night). A fact the lead was built from leaves the list.
- today: up to five statements in priority order (Rest Mode, doses taken
  today, an appointment today or tomorrow that is not already on the
  rail, last night's sleep against the usual, vitals against their
  personal range, cycle day). Module-gated on the server, never padded,
  never asking for anything. A phone shows the first four.
- restMode: passed through while an illness episode is active.
- score.steadyWeeks: how long the score has held, read off the stored
  daily scores, shown under the ring in place of a delta.

briefingLead skips greetings and score sentences the same way, so the
morning push improves with it. Visit times are rendered in the profile
timezone and hour-cycle preference; the cycle day comes from the same
verdict the cycle page uses. The ring, the rail and the charts are
unchanged. OpenAPI regenerated; additive fields only.

docs/api/openapi.yaml

@@ -72427,6 +72427,15 @@ components:
                     so this is what distinguishes a narrow score from a broad one. Optional so older cached digests
                     without the field stay valid.
                   $ref: "#/components/schemas/HealthScoreBasis"
+                steadyWeeks:
+                  description: Whole weeks the score has held where it is (same band, within two points, computed the same way), read off
+                    the stored daily scores. Null when it has not held for two weeks, when the stored record does not
+                    reach today, or when the score moved. Shown in place of a delta, never beside one.
+                  anyOf:
+                    - type: integer
+                      exclusiveMinimum: 0
+                      maximum: 9007199254740991
+                    - type: "null"
               required:
                 - value
                 - band
@@ -72469,8 +72478,56 @@ components:
           anyOf:
             - type: string
             - type: "null"
-          description: First sentence of the cached briefing paragraph. Null while the `briefing` capability is unavailable;
-            `line` then falls to its deterministic floor.
+          description: "The first sentence of the cached briefing paragraph that says something: a greeting or a sentence that
+            only repeats the score is skipped. Null while the `briefing` capability is unavailable or when no sentence
+            qualifies; `line` then falls to its deterministic floor."
+        lead:
+          anyOf:
+            - type: object
+              properties:
+                text:
+                  type: string
+                source:
+                  type: string
+                  enum:
+                    - reaction
+                    - briefing
+                    - signal
+                  description: "`reaction` and `briefing` are cached model text; `signal` is the deterministic sentence about the day's
+                    strongest signal."
+              required:
+                - text
+                - source
+              additionalProperties: false
+            - type: "null"
+          description: "The Today hero's lead line, resolved: the reaction line or a briefing sentence while their capabilities
+            are available, otherwise a deterministic sentence about the day's strongest signal (a vital outside its
+            personal range, an unusual night, vitals in range, last night). Null when there is nothing to say. When the
+            deterministic sentence is built from a fact, that fact is left out of `today`. Additive since v1.40."
+        today:
+          maxItems: 5
+          type: array
+          items:
+            $ref: "#/components/schemas/DailyTodayFact"
+          description: "The Today overview: up to 5 statements about the day in priority order (Rest Mode, medications taken
+            today, an appointment today or tomorrow that is not already on the rail, last night's sleep, vitals against
+            their personal range, cycle day), never padded. A fact about a switched-off module is absent. A narrow
+            surface shows the first 4. Additive since v1.40."
+        restMode:
+          anyOf:
+            - type: object
+              properties:
+                day:
+                  type: integer
+                  exclusiveMinimum: 0
+                  maximum: 9007199254740991
+                  description: 1-based day of the episode on the reader's calendar.
+              required:
+                - day
+              additionalProperties: false
+            - type: "null"
+          description: "Rest Mode: present while an illness episode is active and the illness module is on, else null. Additive
+            since v1.40."
         line:
           type: string
           description: "Push / lock-screen line: cached-AI lead with a deterministic floor."
@@ -72535,6 +72592,9 @@ components:
         - score
         - topSignal
         - briefingLead
+        - lead
+        - today
+        - restMode
         - line
         - worthALook
         - justIn
@@ -72543,6 +72603,39 @@ components:
       additionalProperties: false
       description: The one data spine of the daily-value system — composed from already-cached data, never a fresh AI call.
         Consumed by the Today surface, the daily push, and a future iOS widget.
+    DailyTodayFact:
+      type: object
+      properties:
+        kind:
+          type: string
+          enum:
+            - rest_mode
+            - medications
+            - appointment
+            - sleep
+            - vitals
+            - cycle
+          description: Closed fact kind.
+        label:
+          type: string
+          description: Localised label (resolved server-side).
+        value:
+          type: string
+          description: Localised value (resolved server-side).
+        href:
+          type: string
+          description: The page the fact belongs to.
+        moduleKey:
+          description: The module that admitted the fact; absent for core data.
+          type: string
+      required:
+        - kind
+        - label
+        - value
+        - href
+      additionalProperties: false
+      description: One statement about the day on the Today overview. A fact never asks the reader to do anything; the rail is
+        the only place that does.
     DailyPriorityItem:
       type: object
       properties: