feat(rhema-code): add the colors setting with four palettes

The stored `colors` key names a palette — rhema (the default,
Jadeite), aquamarine, black-and-white, or dracula — and the
Appearance page of /settings cycles it live, like the theme and
icon toggles beside it. Each palette carries a dark and a light
appearance under the existing `theme` key; dracula's light side is
derived, the official palette ships only dark.

The appearance decision moves off token comparison: Theme now
answers is_dark() from the ground/text luminance, so palettes
beyond the original two get the right per-profile fallback tones.

integrations/rhema-calendar-integration/Cargo.toml

@@ -0,0 +1,37 @@
+[package]
+name = "rhema-calendar-integration"
+description = "The calendar integration: ICS/webcal feeds, CalDAV collections, and the Google Calendar API normalized into one occurrence vocabulary for reminder-style dispatch"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+repository.workspace = true
+authors.workspace = true
+# The resident tier is still indev: `cargo publish --workspace` skips
+# it until the claw ships.
+publish = false
+
+[dependencies]
+serde = { workspace = true }
+serde_json = { workspace = true }
+thiserror = { workspace = true }
+async-trait = { workspace = true }
+# HTTP against the three feed kinds: one bounded request per poll, no
+# streaming
+reqwest = { version = "0.12", features = ["json"] }
+# The CalDAV adapter reads 207 multistatus bodies; the element set it
+# cares about is small enough that a pull parser beats a DOM
+quick-xml = "0.41"
+# Every wire time (RFC 3339, iCalendar's compact `YYYYMMDDTHHMMSS[Z]`,
+# `VALUE=DATE` all-days) normalizes to an OffsetDateTime, and the
+# vocabulary's instants round-trip as RFC 3339.
+time = { version = "0.3", default-features = false, features = [
+    "parsing",
+    "formatting",
+    "serde-well-known",
+] }
+
+[dev-dependencies]
+tokio = { workspace = true, features = ["rt-multi-thread", "macros", "sync", "time"] }
+# In-process HTTP mocks for offline tests
+wiremock = "0.6"