feat(registratura): all 4 NAS drives (A/O/P/T) + hostnameIP fallback

- nas-paths.ts: A:\=Arhiva, O:\=Organizare, P:\=Proiecte, T:\=Transfer
- toUncPathByIp() / toFileUrlByIp() helpers for DNS failure fallback
- shareLabelFor() returns human-readable share name for badges
- UI: 'IP' fallback link on hover, badge shows share label
- Validation hints updated to show all 4 drive letters
- Docs updated: CLAUDE.md, ROADMAP.md, SESSION-LOG.md

src/config/nas-paths.ts

@@ -4,6 +4,10 @@
  * The office NAS (\\newamun  /  10.10.10.10) exposes several shares.
  * Windows maps these to drive letters.  This config lets us normalise
  * user-pasted paths to UNC and back, and build clickable `file:///` links.
+ *
+ * Fallback strategy:  hostname → IP.
+ * If DNS fails to resolve `newamun`, every helper has an `...ByIp()` variant
+ * that substitutes the hostname with the raw IP address.
  */
 
 export interface NasDriveMapping {
@@ -15,17 +19,18 @@ export interface NasDriveMapping {
   label: string;
 }
 
-/** All known drive-letter → UNC mappings */
-export const NAS_DRIVE_MAPPINGS: NasDriveMapping[] = [
-  { drive: "P", unc: "\\\\newamun\\Proiecte", label: "Proiecte" },
-  // Add more as needed:
-  // { drive: "S", unc: "\\\\newamun\\Shared", label: "Shared" },
-];
-
-/** NAS hostname / IP — used for display only */
+/** NAS hostname / IP */
 export const NAS_HOST = "newamun";
 export const NAS_IP = "10.10.10.10";
 
+/** All known drive-letter → UNC mappings */
+export const NAS_DRIVE_MAPPINGS: NasDriveMapping[] = [
+  { drive: "A", unc: `\\\\${NAS_HOST}\\Arhiva`, label: "Arhiva" },
+  { drive: "O", unc: `\\\\${NAS_HOST}\\Organizare`, label: "Organizare" },
+  { drive: "P", unc: `\\\\${NAS_HOST}\\Proiecte`, label: "Proiecte" },
+  { drive: "T", unc: `\\\\${NAS_HOST}\\Transfer`, label: "Transfer" },
+];
+
 // ── helpers ──
 
 /**
@@ -34,7 +39,7 @@ export const NAS_IP = "10.10.10.10";
  */
 export function isNetworkPath(input: string): boolean {
   const trimmed = input.trim();
-  // UNC path
+  // UNC path (hostname or IP)
   if (trimmed.startsWith("\\\\")) return true;
   // Mapped drive letter that we recognise
   const match = trimmed.match(/^([A-Z]):\\/i);
@@ -46,7 +51,7 @@ export function isNetworkPath(input: string): boolean {
 }
 
 /**
- * Normalise to UNC path (replace drive letter with \\newamun\Share).
+ * Normalise to UNC path using hostname (replace drive letter with \\newamun\Share).
  * If already UNC or unrecognised → returns the original trimmed.
  */
 export function toUncPath(input: string): string {
@@ -62,13 +67,36 @@ export function toUncPath(input: string): string {
   return trimmed;
 }
 
+/**
+ * Swap hostname → IP in a UNC path.
+ * `\\newamun\Proiecte\file.pdf` → `\\10.10.10.10\Proiecte\file.pdf`
+ * Already-IP or unrecognised paths are returned unchanged.
+ */
+export function toUncPathByIp(input: string): string {
+  const unc = toUncPath(input);
+  const hostPrefix = `\\\\${NAS_HOST}\\`;
+  if (unc.toLowerCase().startsWith(hostPrefix.toLowerCase())) {
+    return `\\\\${NAS_IP}\\${unc.slice(hostPrefix.length)}`;
+  }
+  return unc;
+}
+
 /**
  * Build a clickable `file:///` URL from a UNC or drive-letter path.
- * Windows Explorer opens this natively.
+ * Uses hostname by default.
  */
 export function toFileUrl(input: string): string {
   const unc = toUncPath(input);
-  // file:///\\server\share\path → file://///server/share/path
+  const slashed = unc.replace(/\\/g, "/");
+  return `file:///${slashed}`;
+}
+
+/**
+ * Build a clickable `file:///` URL using the IP fallback.
+ * Use when DNS fails to resolve hostname.
+ */
+export function toFileUrlByIp(input: string): string {
+  const unc = toUncPathByIp(input);
   const slashed = unc.replace(/\\/g, "/");
   return `file:///${slashed}`;
 }
@@ -96,3 +124,15 @@ export function shortDisplayPath(input: string): string {
   const last2 = parts.slice(-2).join("\\");
   return `${share}\\…\\${last2}`;
 }
+
+/**
+ * Return the human-readable label of the share a path belongs to.
+ * e.g. `P:\095\file.pdf` → `Proiecte`
+ */
+export function shareLabelFor(input: string): string | undefined {
+  const unc = toUncPath(input).toLowerCase();
+  for (const m of NAS_DRIVE_MAPPINGS) {
+    if (unc.startsWith(m.unc.toLowerCase())) return m.label;
+  }
+  return undefined;
+}