Make the two session accessors return what they hold

CLAUDE.md

@@ -127,15 +127,19 @@ gotchas (the image provides these):
 
 ### Coverage: what is covered, and what deliberately is not
 
-Line coverage is **95.4%** (`21368/22399`). Measure it by installing pcov in the container
+Line coverage is **96.6%** (`21648/22402`). Measure it by installing pcov in the container
 (`pecl install pcov && docker-php-ext-enable pcov` — the enable step is separate, and a previous
 session's `pecl install` leaves it *installed but disabled*, so a `pecl list | grep pcov` guard
 skips it and every file reports zero), running both suites with `--coverage-clover`, and removing
 the ini again — the image does not ship a coverage driver, and leaving one enabled slows every
 later run. When merging two clover files, read `//file` by xpath: clover nests files inside
-`<package>` elements, so `$xml->project->file` only ever finds the namespace-less ones.
+`<package>` elements, so `$xml->project->file` only ever finds the namespace-less ones. The two
+runs also disagree about which lines *are* statements in a handful of files (9 of 995, 31
+statements — `Application/Account/Services/AccountSearch.php` worst at 48 vs 61), so a merge that
+treats "absent from one report" as uncovered overstates those files. Confirm a per-file gap with a
+focused `--coverage-clover` run before sending anyone to fix it: that file is at 100%.
 
-The remaining ~1000 statements are not a backlog to burn down uniformly. What is left:
+The remaining ~750 statements are not a backlog to burn down uniformly. What is left:
 
 - **Bootstrap (~90 statements).** `Base.php`, `Definitions/CoreDefinitions.php`, `Adapter/In/Cli/Init.php`,
   `Bootstrap/BootstrapBase.php`. These run *before* the container the tests build — `Base.php` is
@@ -189,8 +193,8 @@ A few harness details bite when writing an integration test against a real branc
   drawing a group or profile id that way fails about one run in a hundred, on CI, in whichever pull
   request happened to be open. Use `numberBetween(1, …)`.
 
-The rest is genuinely reachable, and is a long tail rather than a few large files: ~1000
-statements across **295** files, averaging under four statements each — individual error branches,
+The rest is genuinely reachable, and is a long tail rather than a few large files: ~660
+statements across **270** files, averaging under three statements each — individual error branches,
 rarely-hit conditionals and unused accessors. Worth picking off when touching the surrounding
 code; not worth a campaign.
 

src/Domain/Core/Context/SessionContext.php

@@ -127,11 +127,11 @@ public function setLastActivity(int $time): void;
     public function getStartActivity(): int;
 
     /**
-     * Return the color associated with an account
+     * Return the colors associated with the accounts, keyed by the id they belong to
      *
-     * @return string
+     * @return array<int, string>
      */
-    public function getAccountColor(): string;
+    public function getAccountColor(): array;
 
     /**
      * Set the color associated with an account

src/Infrastructure/Context/Session.php

@@ -72,7 +72,9 @@ public static function close(): void
      */
     public function getTheme(): string
     {
-        return $this->getContextKey('theme');
+        // Defaulted, because a session that has not been given a theme yet would otherwise return
+        // null from a method declared to return a string, and raise on the way out.
+        return $this->getContextKey('theme', '');
     }
 
     /**
@@ -298,11 +300,16 @@ public function getLocale(): ?string
     }
 
     /**
-     * Returns the color associated with an account
+     * Returns the colors associated with the accounts, keyed by the id they belong to.
+     *
+     * An array, because that is what setAccountColor() stores: declared as a string, this raised
+     * on its way out the first time anybody read it back.
+     *
+     * @return array<int, string>
      */
-    public function getAccountColor(): string
+    public function getAccountColor(): array
     {
-        return $this->getContextKey('accountcolor');
+        return $this->getContextKey('accountcolor', []);
     }
 
     /**

tests/Unit/Infrastructure/Context/SessionTest.php

@@ -482,6 +482,45 @@ public function theConfigLoadTimeIsCarried()
         self::assertSame(1700000000, $session->getConfigTime());
     }
 
+    /**
+     * The account colours go in as an array and come back as one. Declared as a string, this
+     * raised a TypeError on the way out the first time anybody read back what had been stored —
+     * nothing in the application did, which is the only reason it went unnoticed.
+     *
+     * @throws ContextException
+     * @throws SPException
+     */
+    #[Test]
+    public function theAccountColoursAreCarried()
+    {
+        $session = $this->givenAStartedSession();
+
+        self::assertSame([], $session->getAccountColor(), 'a session with none set has none');
+
+        $session->setAccountColor([100 => '#ff0000', 200 => '#00ff00']);
+
+        self::assertSame([100 => '#ff0000', 200 => '#00ff00'], $session->getAccountColor());
+    }
+
+    /**
+     * And the theme is a string even before one has been chosen — read from a session that has not
+     * been given one, it used to return null from a method declared to return a string.
+     *
+     * @throws ContextException
+     * @throws SPException
+     */
+    #[Test]
+    public function theThemeIsCarriedAndIsAlwaysAString()
+    {
+        $session = $this->givenAStartedSession();
+
+        self::assertSame('', $session->getTheme());
+
+        $session->setTheme('material-blue');
+
+        self::assertSame('material-blue', $session->getTheme());
+    }
+
     /**
      * @throws ContextException
      * @throws SPException