* FIX: Resolve possibly-undefined-variable cases flagged by PHPStan
Fixes several cases of the variable.undefined PHPStan rule instead of
just excluding them via the baseline: a wrong variable used to build a
delete link (dir_add_card.php), an uninitialized $result across a
try/catch (CMailFile), missing GETPOST reads ($mode, $fk_project/$date
reset via unset() creating cross-branch ambiguity), a missing $r
contract check (commonfieldsinimport.inc.php), missing @var/global
annotations for $conf/$langs/$bc, dead extrafields-display code
guarded by the wrong condition (expedition/card.php), and an
undefined $soc passed to formAddObjectLine() where objects have no
buyer thirdparty (replaced with null). Corresponding entries removed
from dev/build/phpstan/phpstan-baseline.neon.
* FIX: Resolve more possibly-undefined-variable cases flagged by PHPStan
Second batch of variable.undefined fixes removed from the baseline:
- Complex conditional flows PHPStan can't prove exhaustive (Stripe key
selection in commoninvoice.class.php, a situation-invoice loop var in
pdf_sponge.modules.php, a product loop var in stock/movement_list.php)
fixed by adding a definite initialization before the ambiguous branch.
- A commented-out $linkback assignment restored in
expensereport/payment/info.php.
- Missing GETPOST reads added (holiday/list.php update-date filters,
product/stock/info.php $action/$socid, projet/comment.php $mode).
- A dead-code $mesg call to dol_htmloutput_mesg() removed from
admin_hrm.php (messages are already shown via setEventMessages()).
- Redundant isset() checks removed in product/reassort.php and
reassortlot.php where $type is unconditionally set earlier in the
same file, so the isset()-false branch was unreachable dead code.
- $user documented as always available in public/bookcal/index.php
(NOREQUIREUSER is not defined on that page).
- A genuinely missing $tmpcode initialization fixed in
attendee_new.php, suggestbooth.php and suggestconference.php: when
an existing thirdparty is reused (or SOCIETE_CODECLIENT_ADDON has no
auto-numbering), $tmpcode was never set before being assigned to
code_client/code_fournisseur.
* add phan fix
* add phan fix
* fix
* fix
* fix
