Phosphor icons: resolve by name via a generated map (T-314)

Replace the 49 hand-maintained named consts with one generated
label→codepoint map (phosphor_glyphs.g.dart, 1512 glyphs from the glyph
table via tool/gen_phosphor_glyphs.dart). Feature code now references
glyphs by their exact kebab-case name — PhosphorIcons.byName('folder') —
with no raw codepoints; this also lets a Lua extension name an icon
without crossing the FFI boundary with a codepoint.

byName is total: an unknown name degrades to the `placeholder` box so the
bug is visible (it's a real error), while phosphor_glyphs_test asserts
every byName('...') literal in lib/ resolves — recovering the typo check a
const gave. Migrated the 89 call sites. Adds EmptyIconPainter for an
intentional blank that still reserves the icon box; ClideFilterBox gains
showIcon to keep the slot aligned when blank.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.pql/changelog/ticket_history/2026-06.sql

@@ -2810,3 +2810,4 @@ The LABEL is the bridge between the two surfaces: Claude attaches a label to eac
 - Each icon renders at multiple sizes: a hero at the existing clideFontWelcomeBanner (52) token plus one sample at each inline font-size token (badge 11 -> body 15), sized off the typography tokens and labelled so the reviewer sees legibility at real UI sizes.
 - The card is display-only (no inline selection); selection happens in the interaction zone (convo box) via a Claude-offered choice list whose options reuse the per-icon labels from the card.
 - Unknown/invalid icon names fail with a clear user error, not a blank glyph.', NULL, '2026-06-10 10:44:06', '2026-06-10 10:44:06', '2026-06-10 10:44:06', NULL, 'a55e979e042abaf7b0758b5dbba183f7', 2) ON CONFLICT(hash) DO NOTHING;
+INSERT INTO ticket_history (ticket_record_id, field, old_value, new_value, changed_by, changed_at, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06FB23Z52EVGQ4ZDAQ5BVAJ13R', 'status', 'ready', 'done', NULL, '2026-06-10 10:46:25', '2026-06-10 10:46:25', '2026-06-10 10:46:25', NULL, '4f76b8c659b36db90ac957a42c610d6f', 2) ON CONFLICT(hash) DO NOTHING;

.pql/changelog/tickets/2026-06.sql

@@ -1715,3 +1715,4 @@ The LABEL is the bridge between the two surfaces: Claude attaches a label to eac
 - Each icon renders at multiple sizes: a hero at the existing clideFontWelcomeBanner (52) token plus one sample at each inline font-size token (badge 11 -> body 15), sized off the typography tokens and labelled so the reviewer sees legibility at real UI sizes.
 - The card is display-only (no inline selection); selection happens in the interaction zone (convo box) via a Claude-offered choice list whose options reuse the per-icon labels from the card.
 - Unknown/invalid icon names fail with a clear user error, not a blank glyph.', 'ready', 'medium', NULL, NULL, NULL, '2026-06-10 10:20:54', '2026-06-10 10:44:06', NULL, '9a25fe730b81f5192fb4142d66fbff85', 2) ON CONFLICT(record_id) DO UPDATE SET type=excluded.type, parent_record_id=excluded.parent_record_id, title=excluded.title, description=excluded.description, status=excluded.status, priority=excluded.priority, assigned_to=excluded.assigned_to, team=excluded.team, decision_ref=excluded.decision_ref, updated_at=excluded.updated_at, deleted_at=excluded.deleted_at, hash=excluded.hash, canonical_version=excluded.canonical_version WHERE excluded.updated_at > tickets.updated_at OR (excluded.updated_at = tickets.updated_at AND excluded.hash > tickets.hash);
+INSERT INTO tickets (record_id, type, parent_record_id, title, description, status, priority, assigned_to, team, decision_ref, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06FB23Z52EVGQ4ZDAQ5BVAJ13R', 'task', '06FB0TNQM5TWC00GW0P3X02HZW', 'Phosphor icons: single label→codepoint map; reference glyphs by name, not codepoint', 'Replace the 49 hand-maintained named consts in lib/widgets/src/icons/phosphor.dart with ONE generated const Map<String,int> of all 1512 Phosphor glyphs (exact kebab-case upstream names → codepoint). Code references glyphs via PhosphorIcons.byName(''folder'') — no raw 0xNNNN in feature code; codepoints live only in the generated map. Migrate the ~32 call sites (by codepoint, not guessed names). Add a test that scans lib/ for byName(''...'') literals and asserts each exists in the map, recovering the compile-time typo safety the named consts gave. Map is regeneratable from .claude/skills/ui-design/references/phosphor-glyphs.md. Foundation for the glyph preview card (T-313).', 'done', 'medium', NULL, NULL, NULL, '2026-06-10 10:24:29', '2026-06-10 10:46:25', NULL, 'aa95db9de3811c6058836e661dd304e8', 2) ON CONFLICT(record_id) DO UPDATE SET type=excluded.type, parent_record_id=excluded.parent_record_id, title=excluded.title, description=excluded.description, status=excluded.status, priority=excluded.priority, assigned_to=excluded.assigned_to, team=excluded.team, decision_ref=excluded.decision_ref, updated_at=excluded.updated_at, deleted_at=excluded.deleted_at, hash=excluded.hash, canonical_version=excluded.canonical_version WHERE excluded.updated_at > tickets.updated_at OR (excluded.updated_at = tickets.updated_at AND excluded.hash > tickets.hash);