fix(chequebook,ctsclearing): surface global stock allocation in UI; fix decided-state check

Receive Stock form now displays the actual highest-allocated serial across
every series (not just silently prefilling the field), so the operator
can see and trust the auto-suggested range start rather than taking it
on faith.

Fixes a real bug where item.decision (which InwardClearingItem.java always
sets to the literal string "PENDING" at creation, never null) was checked
with a plain truthy test everywhere a "has this been decided yet" branch
was needed. Since "PENDING" is a non-empty string, that check was always
true — silently breaking the Decide/View button label, the collapsed
validation summary, the "Awaiting settlement" text, and the decision
dialog itself (which never showed the actual Pass/Return form, even for
still-pending items). Replaced with a proper isDecided() check everywhere.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/assets/translations/en-US.json

@@ -3319,6 +3319,9 @@
       "Only series applicable to this account type are shown": "Only series applicable to this account type are shown",
       "Leaves handed over = books x the series book size": "Leaves handed over = books × the series book size",
       "Auto-suggested to avoid overlap; editable": "Auto-suggested to avoid overlap; editable",
+      "Auto-suggested to avoid overlap across every series; editable": "Auto-suggested to avoid overlap across every series; editable",
+      "Highest leaf serial allocated so far, across every series": "Highest leaf serial allocated so far, across every series",
+      "next available start": "next available start",
       "Calculated from books x book size": "Calculated from books × book size",
       "Searching...": "Searching...",
       "Type at least 4 digits of the account number": "Type at least 4 digits of the account number",