Fix European trip return heuristic for weekend location tracking

Adjust European short trip heuristic from >3 days to >1 day to correctly
detect when user has returned home from European trips. This fixes the
April 29-30, 2023 case where the location incorrectly showed "Sankt Georg, Hamburg"
instead of "Bristol" when the user was free (no events scheduled) after
the foss-north trip ended on April 27.

The previous logic required more than 3 days to pass before assuming
return home from European countries, but for short European trips by
rail/ferry, users typically return within 1-2 days.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

node_modules/ajv-formats/src/limit.ts

@@ -0,0 +1,99 @@
+import type Ajv from "ajv"
+import type {
+  Plugin,
+  CodeKeywordDefinition,
+  KeywordErrorDefinition,
+  Code,
+  Name,
+  ErrorObject,
+} from "ajv"
+import type {AddedFormat} from "ajv/dist/types"
+import type {Rule} from "ajv/dist/compile/rules"
+import {KeywordCxt} from "ajv"
+import {_, str, or, getProperty, operators} from "ajv/dist/compile/codegen"
+
+type Kwd = "formatMaximum" | "formatMinimum" | "formatExclusiveMaximum" | "formatExclusiveMinimum"
+
+type Comparison = "<=" | ">=" | "<" | ">"
+
+const ops = operators
+
+const KWDs: {[K in Kwd]: {okStr: Comparison; ok: Code; fail: Code}} = {
+  formatMaximum: {okStr: "<=", ok: ops.LTE, fail: ops.GT},
+  formatMinimum: {okStr: ">=", ok: ops.GTE, fail: ops.LT},
+  formatExclusiveMaximum: {okStr: "<", ok: ops.LT, fail: ops.GTE},
+  formatExclusiveMinimum: {okStr: ">", ok: ops.GT, fail: ops.LTE},
+}
+
+export type LimitFormatError = ErrorObject<Kwd, {limit: string; comparison: Comparison}>
+
+const error: KeywordErrorDefinition = {
+  message: ({keyword, schemaCode}) => str`should be ${KWDs[keyword as Kwd].okStr} ${schemaCode}`,
+  params: ({keyword, schemaCode}) =>
+    _`{comparison: ${KWDs[keyword as Kwd].okStr}, limit: ${schemaCode}}`,
+}
+
+export const formatLimitDefinition: CodeKeywordDefinition = {
+  keyword: Object.keys(KWDs),
+  type: "string",
+  schemaType: "string",
+  $data: true,
+  error,
+  code(cxt) {
+    const {gen, data, schemaCode, keyword, it} = cxt
+    const {opts, self} = it
+    if (!opts.validateFormats) return
+
+    const fCxt = new KeywordCxt(it, (self.RULES.all.format as Rule).definition, "format")
+    if (fCxt.$data) validate$DataFormat()
+    else validateFormat()
+
+    function validate$DataFormat(): void {
+      const fmts = gen.scopeValue("formats", {
+        ref: self.formats,
+        code: opts.code.formats,
+      })
+      const fmt = gen.const("fmt", _`${fmts}[${fCxt.schemaCode}]`)
+      cxt.fail$data(
+        or(
+          _`typeof ${fmt} != "object"`,
+          _`${fmt} instanceof RegExp`,
+          _`typeof ${fmt}.compare != "function"`,
+          compareCode(fmt)
+        )
+      )
+    }
+
+    function validateFormat(): void {
+      const format = fCxt.schema as string
+      const fmtDef: AddedFormat | undefined = self.formats[format]
+      if (!fmtDef || fmtDef === true) return
+      if (
+        typeof fmtDef != "object" ||
+        fmtDef instanceof RegExp ||
+        typeof fmtDef.compare != "function"
+      ) {
+        throw new Error(`"${keyword}": format "${format}" does not define "compare" function`)
+      }
+      const fmt = gen.scopeValue("formats", {
+        key: format,
+        ref: fmtDef,
+        code: opts.code.formats ? _`${opts.code.formats}${getProperty(format)}` : undefined,
+      })
+
+      cxt.fail$data(compareCode(fmt))
+    }
+
+    function compareCode(fmt: Name): Code {
+      return _`${fmt}.compare(${data}, ${schemaCode}) ${KWDs[keyword as Kwd].fail} 0`
+    }
+  },
+  dependencies: ["format"],
+}
+
+const formatLimitPlugin: Plugin<undefined> = (ajv: Ajv): Ajv => {
+  ajv.addKeyword(formatLimitDefinition)
+  return ajv
+}
+
+export default formatLimitPlugin