fix: update tool count to 52 and add ai-canvas-expand to landing page

ai-canvas-expand was added to constants.ts and route files but never
added to the landing page bento grid, causing all hardcoded counts
to remain at 51. This updates all references across source, docs,
i18n, and tests to reflect the correct count of 52 tools.

packages/shared/src/i18n/en.ts

@@ -1607,7 +1607,7 @@ export const en = {
       heading: "About",
       appName: "SnapOtter",
       appDescription:
-        "A self-hosted, privacy-first image processing suite with 51 tools. Resize, compress, convert, watermark, and automate your image workflows without sending data to the cloud.",
+        "A self-hosted, privacy-first image processing suite with 52 tools. Resize, compress, convert, watermark, and automate your image workflows without sending data to the cloud.",
       versionLabel: "Version:",
       linksHeading: "Links",
       githubLink: "GitHub Repository",
@@ -1650,7 +1650,7 @@ export const en = {
       "No limits. No hidden caps.",
       "Works fully offline.",
       "Unlimited batch processing.",
-      "51 image tools.",
+      "52 image tools.",
       "15 AI models. Your hardware.",
       "Lightning fast. Built on Sharp.",
       "Air-gapped ready.",

packages/shared/src/i18n/nl.ts

@@ -1663,7 +1663,7 @@ export const nl: TranslationKeys = {
       heading: "Over",
       appName: "SnapOtter",
       appDescription:
-        "Een zelf-gehoste, privacy-first beeldverwerkingssuite met 51 tools. Schalen, comprimeren, converteren, watermerken en je beeldworkflows automatiseren zonder data naar de cloud te sturen.",
+        "Een zelf-gehoste, privacy-first beeldverwerkingssuite met 52 tools. Schalen, comprimeren, converteren, watermerken en je beeldworkflows automatiseren zonder data naar de cloud te sturen.",
       versionLabel: "Versie:",
       linksHeading: "Links",
       githubLink: "GitHub-repository",