web: WIP: Update askama to 0.15

It throws new warnings about how I call the title block multiple times
in the base template. Tracking this on their discussion tracker:

askama-rs/askama#657 (reply in thread)

Author: BBaoVanC

Cargo.lock

@@ -13,7 +13,7 @@ default-run = "bobashare-web"
 
 [dependencies]
 anyhow = "1.0.65"
-askama = "0.14.0"
+askama = "0.15.1"
 axum = { version = "0.8.0", features = ["multipart"] }
 axum-extra = { version = "0.12.5", features = ["typed-header", "with-rejection"] }
 bobashare = { path = "../bobashare" }

bobashare-web/Cargo.toml

@@ -1,6 +1,6 @@
 use askama::Result;
 use chrono::TimeDelta;
-use humansize::format_size;
+use ::humansize::format_size;
 
 fn pluralize(input: &str, count: i64) -> String {
     if count == 1 {
@@ -11,6 +11,7 @@ fn pluralize(input: &str, count: i64) -> String {
 }
 
 // TODO: this would be nice and easy to test
+#[askama::filter_fn]
 pub fn humanduration(duration: &TimeDelta, _: &dyn askama::Values) -> Result<String> {
     let duration = *duration;
     if duration < TimeDelta::try_minutes(1).unwrap() {
@@ -36,6 +37,7 @@ pub fn humanduration(duration: &TimeDelta, _: &dyn askama::Values) -> Result<Str
     // probably no point going past months
 }
 
+#[askama::filter_fn]
 pub fn humansize(size: &u64, _: &dyn askama::Values) -> Result<String> {
-    Ok(format_size(*size, humansize::BINARY))
+    Ok(format_size(*size, ::humansize::BINARY))
 }

bobashare-web/src/views/filters.rs

@@ -2,7 +2,7 @@
 
 {% block title %}{{ filename }}{% endblock %}
 {% block preview_metadata %}
-    {% let filename_truncated %}
+    {% decl filename_truncated %}
     {% if filename.len() > 50 %}
         {# U+2026 is ellipses (three dots) #}
         {% let filename_truncated = format!("{:.50}\u{2026}", self.filename) %}
@@ -54,14 +54,14 @@
 {% endblock %}
 
 {% block main %}
-    {% let expiry_human %}
+    {% decl expiry_human %}
     {% if let Some(e) = expiry_relative %}
         {% let expiry_human = e|humanduration %}
     {% else %}
         {% let expiry_human = String::from("never") %}
     {% endif %}
 
-    {% let expiry_exact %}
+    {% decl expiry_exact %}
     {% if let Some(e) = expiry_date %}
         {% let expiry_exact = e.to_string() %}
     {% else %}